21007076631 has 4 divisors (see below), whose sum is σ = 28009435512. Its totient is φ = 14004717752.

The previous prime is 21007076617. The next prime is 21007076689. The reversal of 21007076631 is 13667070012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21007076631 - 2¹⁴ = 21007060247 is a prime.

It is a super-2 number, since 2×21007076631² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21007076592 and 21007076601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21007077631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501179436 + ... + 3501179441.

It is an arithmetic number, because the mean of its divisors is an integer number (7002358878).

Almost surely, 2^21007076631 is an apocalyptic number.

21007076631 is a deficient number, since it is larger than the sum of its proper divisors (7002358881).

21007076631 is an equidigital number, since it uses as much as digits as its factorization.

21007076631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002358880.

The product of its (nonzero) digits is 10584, while the sum is 33.

The spelling of 21007076631 in words is "twenty-one billion, seven million, seventy-six thousand, six hundred thirty-one".