21869187966031 has 16 divisors (see below), whose sum is σ = 26309033625600. Its totient is φ = 17758278999648.

The previous prime is 21869187966023. The next prime is 21869187966037. The reversal of 21869187966031 is 13066978196812.

It is a cyclic number.

It is not a de Polignac number, because 21869187966031 - 2³ = 21869187966023 is a prime.

It is a super-2 number, since 2×21869187966031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869187966037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15474381 + ... + 16828393.

It is an arithmetic number, because the mean of its divisors is an integer number (1644314601600).

Almost surely, 2^{21869187966031} is an apocalyptic number.

21869187966031 is a deficient number, since it is larger than the sum of its proper divisors (4439845659569).

21869187966031 is a wasteful number, since it uses less digits than its factorization.

21869187966031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475478.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 21869187966031 in words is "twenty-one trillion, eight hundred sixty-nine billion, one hundred eighty-seven million, nine hundred sixty-six thousand, thirty-one".