21077110631 has 2 divisors, whose sum is σ = 21077110632. Its totient is φ = 21077110630.

The previous prime is 21077110619. The next prime is 21077110667. The reversal of 21077110631 is 13601177012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21077110631 - 2²² = 21072916327 is a prime.

It is a super-2 number, since 2×21077110631² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21077110594 and 21077110603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21077110531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538555315 + 10538555316.

It is an arithmetic number, because the mean of its divisors is an integer number (10538555316).

Almost surely, 2^21077110631 is an apocalyptic number.

21077110631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077110631 is an equidigital number, since it uses as much as digits as its factorization.

21077110631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 29.

Adding to 21077110631 its reverse (13601177012), we get a palindrome (34678287643).

The spelling of 21077110631 in words is "twenty-one billion, seventy-seven million, one hundred ten thousand, six hundred thirty-one".