21020023310053 has 2 divisors, whose sum is σ = 21020023310054. Its totient is φ = 21020023310052.

The previous prime is 21020023309991. The next prime is 21020023310179. The reversal of 21020023310053 is 35001332002012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21000387733924 + 19635576129 = 4582618^2 + 140127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020023310053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020023310653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510011655026 + 10510011655027.

It is an arithmetic number, because the mean of its divisors is an integer number (10510011655027).

Almost surely, 2^{21020023310053} is an apocalyptic number.

It is an amenable number.

21020023310053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020023310053 is an equidigital number, since it uses as much as digits as its factorization.

21020023310053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21020023310053 its reverse (35001332002012), we get a palindrome (56021355312065).

The spelling of 21020023310053 in words is "twenty-one trillion, twenty billion, twenty-three million, three hundred ten thousand, fifty-three".