21658145582412 has 36 divisors (see below), whose sum is σ = 54758735381896. Its totient is φ = 7217831583360.

The previous prime is 21658145582393. The next prime is 21658145582417. The reversal of 21658145582412 is 21428554185612.

21658145582412 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 8 + 1 + 45 + 582 + 4 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21658145582417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64424914 + ... + 64760217.

Almost surely, 2^{21658145582412} is an apocalyptic number.

It is an amenable number.

21658145582412 is an abundant number, since it is smaller than the sum of its proper divisors (33100589799484).

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

21658145582412 is a wasteful number, since it uses less digits than its factorization.

21658145582412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129189798 (or 129189793 counting only the distinct ones).

The product of its digits is 6144000, while the sum is 54.

The spelling of 21658145582412 in words is "twenty-one trillion, six hundred fifty-eight billion, one hundred forty-five million, five hundred eighty-two thousand, four hundred twelve".