21919113631 has 2 divisors, whose sum is σ = 21919113632. Its totient is φ = 21919113630.

The previous prime is 21919113563. The next prime is 21919113637. The reversal of 21919113631 is 13631191912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21919113631 - 2⁹ = 21919113119 is a prime.

It is a super-2 number, since 2×21919113631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21919113637) 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, 10959556815 + 10959556816.

It is an arithmetic number, because the mean of its divisors is an integer number (10959556816).

Almost surely, 2^21919113631 is an apocalyptic number.

21919113631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21919113631 is an equidigital number, since it uses as much as digits as its factorization.

21919113631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 37.

The spelling of 21919113631 in words is "twenty-one billion, nine hundred nineteen million, one hundred thirteen thousand, six hundred thirty-one".