21054999612 has 24 divisors (see below), whose sum is σ = 49226800000. Its totient is φ = 7004266416.

The previous prime is 21054999611. The next prime is 21054999767. The reversal of 21054999612 is 21699945012.

It is a super-2 number, since 2×21054999612² (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 (21054999611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1752112 + ... + 1764087.

Almost surely, 2^21054999612 is an apocalyptic number.

It is an amenable number.

21054999612 is an abundant number, since it is smaller than the sum of its proper divisors (28171800388).

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

21054999612 is a wasteful number, since it uses less digits than its factorization.

21054999612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3516705 (or 3516703 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The spelling of 21054999612 in words is "twenty-one billion, fifty-four million, nine hundred ninety-nine thousand, six hundred twelve".