21325061250261 has 32 divisors (see below), whose sum is σ = 31873050385920. Its totient is φ = 14090548534272.

The previous prime is 21325061250191. The next prime is 21325061250263. The reversal of 21325061250261 is 16205216052312.

21325061250261 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 506 + 125 + 0 + 26 + 1 = 666.

It is not a de Polignac number, because 21325061250261 - 2¹¹ = 21325061248213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325061250263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199259181 + ... + 199366173.

It is an arithmetic number, because the mean of its divisors is an integer number (996032824560).

Almost surely, 2^{21325061250261} is an apocalyptic number.

It is an amenable number.

21325061250261 is a deficient number, since it is larger than the sum of its proper divisors (10547989135659).

21325061250261 is a wasteful number, since it uses less digits than its factorization.

21325061250261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172442 (or 172436 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 21325061250261 in words is "twenty-one trillion, three hundred twenty-five billion, sixty-one million, two hundred fifty thousand, two hundred sixty-one".