21253100255637 has 8 divisors (see below), whose sum is σ = 28337489152704. Its totient is φ = 14168722431168.

The previous prime is 21253100255599. The next prime is 21253100255641. The reversal of 21253100255637 is 73655200135212.

It is a happy number.

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

It is not a de Polignac number, because 21253100255637 - 2²⁰ = 21253099207061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253100250637) 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, 4258813 + ... + 7787405.

It is an arithmetic number, because the mean of its divisors is an integer number (3542186144088).

Almost surely, 2^{21253100255637} is an apocalyptic number.

It is an amenable number.

21253100255637 is a deficient number, since it is larger than the sum of its proper divisors (7084388897067).

21253100255637 is a wasteful number, since it uses less digits than its factorization.

21253100255637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536299.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 21253100255637 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred fifty-five thousand, six hundred thirty-seven".