21355420614053 has 2 divisors, whose sum is σ = 21355420614054. Its totient is φ = 21355420614052.

The previous prime is 21355420613977. The next prime is 21355420614071. The reversal of 21355420614053 is 35041602455312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12407287670404 + 8948132943649 = 3522398^2 + 2991343^2 .

It is a cyclic number.

It is not a de Polignac number, because 21355420614053 - 2²⁸ = 21355152178597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21355420614053.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355420614553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677710307026 + 10677710307027.

It is an arithmetic number, because the mean of its divisors is an integer number (10677710307027).

Almost surely, 2^{21355420614053} is an apocalyptic number.

It is an amenable number.

21355420614053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355420614053 is an equidigital number, since it uses as much as digits as its factorization.

21355420614053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 21355420614053 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred twenty million, six hundred fourteen thousand, fifty-three".