21507526505151 has 12 divisors (see below), whose sum is σ = 31067323763112. Its totient is φ = 14337937193136.

The previous prime is 21507526505141. The next prime is 21507526505183. The reversal of 21507526505151 is 15150562570512.

21507526505151 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 75 + 2 + 65 + 0 + 515 + 1 = 666.

It is not a de Polignac number, because 21507526505151 - 2³⁷ = 21370087551679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21507526505097 and 21507526505106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507526505141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34154856 + ... + 34778861.

It is an arithmetic number, because the mean of its divisors is an integer number (2588943646926).

Almost surely, 2^{21507526505151} is an apocalyptic number.

21507526505151 is a deficient number, since it is larger than the sum of its proper divisors (9559797257961).

21507526505151 is a wasteful number, since it uses less digits than its factorization.

21507526505151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68968390 (or 68968387 counting only the distinct ones).

The product of its (nonzero) digits is 525000, while the sum is 45.

The spelling of 21507526505151 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, five hundred five thousand, one hundred fifty-one".