21300313131021 has 32 divisors (see below), whose sum is σ = 30285233072640. Its totient is φ = 13277623892544.

The previous prime is 21300313131001. The next prime is 21300313131023. The reversal of 21300313131021 is 12013131300312.

It is a happy number.

It is not a de Polignac number, because 21300313131021 - 2¹⁴ = 21300313114637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300313131023) 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, 2570250 + ... + 7014756.

It is an arithmetic number, because the mean of its divisors is an integer number (946413533520).

Almost surely, 2^{21300313131021} is an apocalyptic number.

It is an amenable number.

21300313131021 is a deficient number, since it is larger than the sum of its proper divisors (8984919941619).

21300313131021 is a wasteful number, since it uses less digits than its factorization.

21300313131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445625.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 21300313131021 its reverse (12013131300312), we get a palindrome (33313444431333).

The spelling of 21300313131021 in words is "twenty-one trillion, three hundred billion, three hundred thirteen million, one hundred thirty-one thousand, twenty-one".