21402548053 has 2 divisors, whose sum is σ = 21402548054. Its totient is φ = 21402548052.

The previous prime is 21402547993. The next prime is 21402548059. The reversal of 21402548053 is 35084520412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17127742129 + 4274805924 = 130873^2 + 65382^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402548053 - 2⁹ = 21402547541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21402548059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701274026 + 10701274027.

It is an arithmetic number, because the mean of its divisors is an integer number (10701274027).

Almost surely, 2^21402548053 is an apocalyptic number.

It is an amenable number.

21402548053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402548053 is an equidigital number, since it uses as much as digits as its factorization.

21402548053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 21402548053 in words is "twenty-one billion, four hundred two million, five hundred forty-eight thousand, fifty-three".