2121012021113 has 4 divisors (see below), whose sum is σ = 2121156923520. Its totient is φ = 2120867118708.

The previous prime is 2121012021101. The next prime is 2121012021137. The reversal of 2121012021113 is 3111202101212.

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.

It is a cyclic number.

It is not a de Polignac number, because 2121012021113 - 2⁴ = 2121012021097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121012021091 and 2121012021100.

It is not an unprimeable number, because it can be changed into a prime (2121012021173) 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, 72429245 + ... + 72458522.

It is an arithmetic number, because the mean of its divisors is an integer number (530289230880).

Almost surely, 2^{2121012021113} is an apocalyptic number.

It is an amenable number.

2121012021113 is a deficient number, since it is larger than the sum of its proper divisors (144902407).

2121012021113 is a wasteful number, since it uses less digits than its factorization.

2121012021113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144902406.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2121012021113 its reverse (3111202101212), we get a palindrome (5232214122325).

The spelling of 2121012021113 in words is "two trillion, one hundred twenty-one billion, twelve million, twenty-one thousand, one hundred thirteen".