21031431000101 has 2 divisors, whose sum is σ = 21031431000102. Its totient is φ = 21031431000100.

The previous prime is 21031431000091. The next prime is 21031431000157. The reversal of 21031431000101 is 10100013413012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21000726849025 + 30704151076 = 4582655^2 + 175226^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031431000101 - 2⁶ = 21031431000037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21031431000101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031431000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515715500050 + 10515715500051.

It is an arithmetic number, because the mean of its divisors is an integer number (10515715500051).

Almost surely, 2^{21031431000101} is an apocalyptic number.

It is an amenable number.

21031431000101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031431000101 is an equidigital number, since it uses as much as digits as its factorization.

21031431000101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21031431000101 its reverse (10100013413012), we get a palindrome (31131444413113).

The spelling of 21031431000101 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, one hundred one", and thus it is an aban number.