13121022021 has 16 divisors (see below), whose sum is σ = 18001589760. Its totient is φ = 8496174960.

The previous prime is 13121022011. The next prime is 13121022023. The reversal of 13121022021 is 12022012131.

It is not a de Polignac number, because 13121022021 - 2⁹ = 13121021509 is a prime.

It is a super-2 number, since 2×13121022021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121022023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261025 + ... + 307206.

It is an arithmetic number, because the mean of its divisors is an integer number (1125099360).

Almost surely, 2^13121022021 is an apocalyptic number.

It is an amenable number.

13121022021 is a deficient number, since it is larger than the sum of its proper divisors (4880567739).

13121022021 is a wasteful number, since it uses less digits than its factorization.

13121022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568456.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 13121022021 its reverse (12022012131), we get a palindrome (25143034152).

The spelling of 13121022021 in words is "thirteen billion, one hundred twenty-one million, twenty-two thousand, twenty-one".