21400520064653 has 2 divisors, whose sum is σ = 21400520064654. Its totient is φ = 21400520064652.

The previous prime is 21400520064617. The next prime is 21400520064659. The reversal of 21400520064653 is 35646002500412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18782845230724 + 2617674833929 = 4333918^2 + 1617923^2 .

It is a cyclic number.

It is not a de Polignac number, because 21400520064653 - 2²⁴ = 21400503287437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400520064659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700260032326 + 10700260032327.

It is an arithmetic number, because the mean of its divisors is an integer number (10700260032327).

Almost surely, 2^{21400520064653} is an apocalyptic number.

It is an amenable number.

21400520064653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400520064653 is an equidigital number, since it uses as much as digits as its factorization.

21400520064653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 21400520064653 in words is "twenty-one trillion, four hundred billion, five hundred twenty million, sixty-four thousand, six hundred fifty-three".