21072630331 has 2 divisors, whose sum is σ = 21072630332. Its totient is φ = 21072630330.

The previous prime is 21072630311. The next prime is 21072630343. The reversal of 21072630331 is 13303627012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21072630331 - 2¹⁹ = 21072106043 is a prime.

It is a super-2 number, since 2×21072630331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21072630331.

It is not a weakly prime, because it can be changed into another prime (21072630311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536315165 + 10536315166.

It is an arithmetic number, because the mean of its divisors is an integer number (10536315166).

Almost surely, 2^21072630331 is an apocalyptic number.

21072630331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21072630331 is an equidigital number, since it uses as much as digits as its factorization.

21072630331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The spelling of 21072630331 in words is "twenty-one billion, seventy-two million, six hundred thirty thousand, three hundred thirty-one".