21375176002551 has 24 divisors (see below), whose sum is σ = 35286129069984. Its totient is φ = 12214343280960.

The previous prime is 21375176002541. The next prime is 21375176002589. The reversal of 21375176002551 is 15520067157312.

21375176002551 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 5 + 17 + 600 + 25 + 5 + 1 = 666.

It is not a de Polignac number, because 21375176002551 - 2⁷ = 21375176002423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21375176002497 and 21375176002506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375176002541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28934065 + ... + 29663621.

It is an arithmetic number, because the mean of its divisors is an integer number (1470255377916).

Almost surely, 2^{21375176002551} is an apocalyptic number.

21375176002551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21375176002551 is a deficient number, since it is larger than the sum of its proper divisors (13910953067433).

21375176002551 is a wasteful number, since it uses less digits than its factorization.

21375176002551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194631 (or 1194628 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 21375176002551 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-six million, two thousand, five hundred fifty-one".