21550331405151 has 16 divisors (see below), whose sum is σ = 31939825818720. Its totient is φ = 14360853588480.

The previous prime is 21550331405149. The next prime is 21550331405221. The reversal of 21550331405151 is 15150413305512.

21550331405151 is a `hidden beast` number, since 2 + 1 + 5 + 503 + 3 + 140 + 5 + 1 + 5 + 1 = 666.

It is not a de Polignac number, because 21550331405151 - 2¹ = 21550331405149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550331505151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167546050 + ... + 167674623.

It is an arithmetic number, because the mean of its divisors is an integer number (1996239113670).

Almost surely, 2^{21550331405151} is an apocalyptic number.

21550331405151 is a deficient number, since it is larger than the sum of its proper divisors (10389494413569).

21550331405151 is a wasteful number, since it uses less digits than its factorization.

21550331405151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335223063 (or 335223057 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 21550331405151 in words is "twenty-one trillion, five hundred fifty billion, three hundred thirty-one million, four hundred five thousand, one hundred fifty-one".