21812158062885 has 32 divisors (see below), whose sum is σ = 35478314016768. Its totient is φ = 11441454292800.

The previous prime is 21812158062841. The next prime is 21812158062941. The reversal of 21812158062885 is 58826085121812.

It is not a de Polignac number, because 21812158062885 - 2¹⁶ = 21812157997349 is a prime.

It is a super-2 number, since 2×21812158062885² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39004441 + ... + 39559710.

It is an arithmetic number, because the mean of its divisors is an integer number (1108697313024).

Almost surely, 2^{21812158062885} is an apocalyptic number.

It is an amenable number.

21812158062885 is a deficient number, since it is larger than the sum of its proper divisors (13666155953883).

21812158062885 is a wasteful number, since it uses less digits than its factorization.

21812158062885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78564465.

The product of its (nonzero) digits is 4915200, while the sum is 57.

The spelling of 21812158062885 in words is "twenty-one trillion, eight hundred twelve billion, one hundred fifty-eight million, sixty-two thousand, eight hundred eighty-five".