20970994055231 has 16 divisors (see below), whose sum is σ = 23785325491200. Its totient is φ = 18316824235200.

The previous prime is 20970994055159. The next prime is 20970994055243. The reversal of 20970994055231 is 13255049907902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20970994055231 - 2¹⁴ = 20970994038847 is a prime.

It is a super-2 number, since 2×20970994055231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970994055281) 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, 221170286 + ... + 221265083.

It is an arithmetic number, because the mean of its divisors is an integer number (1486582843200).

Almost surely, 2^{20970994055231} is an apocalyptic number.

20970994055231 is a deficient number, since it is larger than the sum of its proper divisors (2814331435969).

20970994055231 is a wasteful number, since it uses less digits than its factorization.

20970994055231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442435550.

The product of its (nonzero) digits is 6123600, while the sum is 56.

The spelling of 20970994055231 in words is "twenty trillion, nine hundred seventy billion, nine hundred ninety-four million, fifty-five thousand, two hundred thirty-one".