21377015353 has 2 divisors, whose sum is σ = 21377015354. Its totient is φ = 21377015352.

The previous prime is 21377015293. The next prime is 21377015447. The reversal of 21377015353 is 35351077312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21202854544 + 174160809 = 145612^2 + 13197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21377015353 is a prime.

It is not a weakly prime, because it can be changed into another prime (21377015453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688507676 + 10688507677.

It is an arithmetic number, because the mean of its divisors is an integer number (10688507677).

Almost surely, 2^21377015353 is an apocalyptic number.

It is an amenable number.

21377015353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377015353 is an equidigital number, since it uses as much as digits as its factorization.

21377015353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66150, while the sum is 37.

The spelling of 21377015353 in words is "twenty-one billion, three hundred seventy-seven million, fifteen thousand, three hundred fifty-three".