21490990675 has 24 divisors (see below), whose sum is σ = 33224516352. Its totient is φ = 13396980000.

The previous prime is 21490990669. The next prime is 21490990711. The reversal of 21490990675 is 57609909412.

It is not a de Polignac number, because 21490990675 - 2³ = 21490990667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5580151 + ... + 5584000.

It is an arithmetic number, because the mean of its divisors is an integer number (1384354848).

Almost surely, 2^21490990675 is an apocalyptic number.

21490990675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21490990675 is a deficient number, since it is larger than the sum of its proper divisors (11733525677).

21490990675 is a wasteful number, since it uses less digits than its factorization.

21490990675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11164179 (or 11164174 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 21490990675 in words is "twenty-one billion, four hundred ninety million, nine hundred ninety thousand, six hundred seventy-five".