20013124202221 has 4 divisors (see below), whose sum is σ = 20013153812352. Its totient is φ = 20013094592092.

The previous prime is 20013124202177. The next prime is 20013124202251. The reversal of 20013124202221 is 12220242131002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20013124202221 - 2³¹ = 20010976718573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013124202192 and 20013124202201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013124202251) 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, 13766971 + ... + 15151096.

It is an arithmetic number, because the mean of its divisors is an integer number (5003288453088).

Almost surely, 2^{20013124202221} is an apocalyptic number.

It is an amenable number.

20013124202221 is a deficient number, since it is larger than the sum of its proper divisors (29610131).

20013124202221 is an equidigital number, since it uses as much as digits as its factorization.

20013124202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29610130.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20013124202221 its reverse (12220242131002), we get a palindrome (32233366333223).

The spelling of 20013124202221 in words is "twenty trillion, thirteen billion, one hundred twenty-four million, two hundred two thousand, two hundred twenty-one".