21969931519 has 2 divisors, whose sum is σ = 21969931520. Its totient is φ = 21969931518.

The previous prime is 21969931469. The next prime is 21969931523. The reversal of 21969931519 is 91513996912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21969931519 - 2¹⁵ = 21969898751 is a prime.

It is a super-2 number, since 2×21969931519² (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 21969931519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21969931559) 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, 10984965759 + 10984965760.

It is an arithmetic number, because the mean of its divisors is an integer number (10984965760).

Almost surely, 2^21969931519 is an apocalyptic number.

21969931519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21969931519 is an equidigital number, since it uses as much as digits as its factorization.

21969931519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1180980, while the sum is 55.

The spelling of 21969931519 in words is "twenty-one billion, nine hundred sixty-nine million, nine hundred thirty-one thousand, five hundred nineteen".