21531023190 has 24 divisors (see below), whose sum is σ = 55980660528. Its totient is φ = 5741606160.

The previous prime is 21531023183. The next prime is 21531023191. The reversal of 21531023190 is 9132013512.

21531023190 is a `hidden beast` number, since 21 + 531 + 0 + 23 + 1 + 90 = 666.

It is a super-2 number, since 2×21531023190² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531023191) 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 11 ways as a sum of consecutive naturals, for example, 119616706 + ... + 119616885.

It is an arithmetic number, because the mean of its divisors is an integer number (2332527522).

Almost surely, 2^21531023190 is an apocalyptic number.

21531023190 is an abundant number, since it is smaller than the sum of its proper divisors (34449637338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21531023190 is a wasteful number, since it uses less digits than its factorization.

21531023190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239233604 (or 239233601 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The spelling of 21531023190 in words is "twenty-one billion, five hundred thirty-one million, twenty-three thousand, one hundred ninety".