21835890492 has 48 divisors (see below), whose sum is σ = 54892951680. Its totient is φ = 6715885248.

The previous prime is 21835890469. The next prime is 21835890509. The reversal of 21835890492 is 29409853812.

It is a super-2 number, since 2×21835890492² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355143 + ... + 412065.

It is an arithmetic number, because the mean of its divisors is an integer number (1143603160).

Almost surely, 2^21835890492 is an apocalyptic number.

It is an amenable number.

21835890492 is an abundant number, since it is smaller than the sum of its proper divisors (33057061188).

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

21835890492 is a wasteful number, since it uses less digits than its factorization.

21835890492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59402 (or 59400 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 21835890492 in words is "twenty-one billion, eight hundred thirty-five million, eight hundred ninety thousand, four hundred ninety-two".