21673994452 has 12 divisors (see below), whose sum is σ = 41377625856. Its totient is φ = 9851815640.

The previous prime is 21673994401. The next prime is 21673994477. The reversal of 21673994452 is 25449937612.

It is a self number, because there is not a number n which added to its sum of digits gives 21673994452.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 246295348 + ... + 246295435.

It is an arithmetic number, because the mean of its divisors is an integer number (3448135488).

Almost surely, 2^21673994452 is an apocalyptic number.

21673994452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21673994452 is a deficient number, since it is larger than the sum of its proper divisors (19703631404).

21673994452 is a wasteful number, since it uses less digits than its factorization.

21673994452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492590798 (or 492590796 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The spelling of 21673994452 in words is "twenty-one billion, six hundred seventy-three million, nine hundred ninety-four thousand, four hundred fifty-two".