21031431000157 has 2 divisors, whose sum is σ = 21031431000158. Its totient is φ = 21031431000156.

The previous prime is 21031431000101. The next prime is 21031431000193. The reversal of 21031431000157 is 75100013413012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15162348180996 + 5869082819161 = 3893886^2 + 2422619^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031431000157 - 2¹⁵ = 21031430967389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031437000157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515715500078 + 10515715500079.

It is an arithmetic number, because the mean of its divisors is an integer number (10515715500079).

Almost surely, 2^{21031431000157} is an apocalyptic number.

It is an amenable number.

21031431000157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031431000157 is an equidigital number, since it uses as much as digits as its factorization.

21031431000157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 21031431000157 its reverse (75100013413012), we get a palindrome (96131444413169).

The spelling of 21031431000157 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, one hundred fifty-seven", and thus it is an aban number.