21020402314253 has 2 divisors, whose sum is σ = 21020402314254. Its totient is φ = 21020402314252.

The previous prime is 21020402314231. The next prime is 21020402314267. The reversal of 21020402314253 is 35241320402012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19921064743204 + 1099337571049 = 4463302^2 + 1048493^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020402314253 - 2¹² = 21020402310157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020402314853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510201157126 + 10510201157127.

It is an arithmetic number, because the mean of its divisors is an integer number (10510201157127).

Almost surely, 2^{21020402314253} is an apocalyptic number.

It is an amenable number.

21020402314253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020402314253 is an equidigital number, since it uses as much as digits as its factorization.

21020402314253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21020402314253 its reverse (35241320402012), we get a palindrome (56261722716265).

The spelling of 21020402314253 in words is "twenty-one trillion, twenty billion, four hundred two million, three hundred fourteen thousand, two hundred fifty-three".