20102122102021 has 4 divisors (see below), whose sum is σ = 20102131128544. Its totient is φ = 20102113075500.

The previous prime is 20102122101953. The next prime is 20102122102039. The reversal of 20102122102021 is 12020122120102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102122102021 is a prime.

It is a super-2 number, since 2×20102122102021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102122101986 and 20102122102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102122102921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1480966 + ... + 6511336.

It is an arithmetic number, because the mean of its divisors is an integer number (5025532782136).

Almost surely, 2^{20102122102021} is an apocalyptic number.

It is an amenable number.

20102122102021 is a deficient number, since it is larger than the sum of its proper divisors (9026523).

20102122102021 is an equidigital number, since it uses as much as digits as its factorization.

20102122102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9026522.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20102122102021 its reverse (12020122120102), we get a palindrome (32122244222123).

The spelling of 20102122102021 in words is "twenty trillion, one hundred two billion, one hundred twenty-two million, one hundred two thousand, twenty-one".