21500225526131 has 4 divisors (see below), whose sum is σ = 23454791483064. Its totient is φ = 19545659569200.

The previous prime is 21500225526079. The next prime is 21500225526167. The reversal of 21500225526131 is 13162552200512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21500225526131 - 2³⁰ = 21499151784307 is a prime.

It is a super-2 number, since 2×21500225526131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21500225526091 and 21500225526100.

It is not an unprimeable number, because it can be changed into a prime (21500225522131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977282978450 + ... + 977282978471.

It is an arithmetic number, because the mean of its divisors is an integer number (5863697870766).

Almost surely, 2^{21500225526131} is an apocalyptic number.

21500225526131 is a deficient number, since it is larger than the sum of its proper divisors (1954565956933).

21500225526131 is a wasteful number, since it uses less digits than its factorization.

21500225526131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954565956932.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 21500225526131 its reverse (13162552200512), we get a palindrome (34662777726643).

The spelling of 21500225526131 in words is "twenty-one trillion, five hundred billion, two hundred twenty-five million, five hundred twenty-six thousand, one hundred thirty-one".