21221020000158 has 32 divisors (see below), whose sum is σ = 48737270816640. Its totient is φ = 6092158851360.

The previous prime is 21221020000157. The next prime is 21221020000171. The reversal of 21221020000158 is 85100002012212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221020000157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8461330485 + ... + 8461332992.

It is an arithmetic number, because the mean of its divisors is an integer number (1523039713020).

Almost surely, 2^{21221020000158} is an apocalyptic number.

21221020000158 is an abundant number, since it is smaller than the sum of its proper divisors (27516250816482).

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

21221020000158 is a wasteful number, since it uses less digits than its factorization.

21221020000158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16922663512.

The product of its (nonzero) digits is 640, while the sum is 24.

The spelling of 21221020000158 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, one hundred fifty-eight", and thus it is an aban number.