21131350025053 has 8 divisors (see below), whose sum is σ = 22374859228920. Its totient is φ = 19887895111680.

The previous prime is 21131350025039. The next prime is 21131350025069. The reversal of 21131350025053 is 35052005313112.

It can be written as a sum of positive squares in 4 ways, for example, as 5196858834244 + 15934491190809 = 2279662^2 + 3991803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21131350025053 is a prime.

It is a super-3 number, since 3×21131350025053³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131350025353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12769908 + ... + 14329453.

It is an arithmetic number, because the mean of its divisors is an integer number (2796857403615).

Almost surely, 2^{21131350025053} is an apocalyptic number.

It is an amenable number.

21131350025053 is a deficient number, since it is larger than the sum of its proper divisors (1243509203867).

21131350025053 is a wasteful number, since it uses less digits than its factorization.

21131350025053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27145247.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 21131350025053 its reverse (35052005313112), we get a palindrome (56183355338165).

The spelling of 21131350025053 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred fifty million, twenty-five thousand, fifty-three".