21602474060621 has 2 divisors, whose sum is σ = 21602474060622. Its totient is φ = 21602474060620.

The previous prime is 21602474060611. The next prime is 21602474060711. The reversal of 21602474060621 is 12606047420612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19345526706025 + 2256947354596 = 4398355^2 + 1502314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21602474060621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21602474060611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801237030310 + 10801237030311.

It is an arithmetic number, because the mean of its divisors is an integer number (10801237030311).

Almost surely, 2^{21602474060621} is an apocalyptic number.

It is an amenable number.

21602474060621 is a deficient number, since it is larger than the sum of its proper divisors (1).

21602474060621 is an equidigital number, since it uses as much as digits as its factorization.

21602474060621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 21602474060621 in words is "twenty-one trillion, six hundred two billion, four hundred seventy-four million, sixty thousand, six hundred twenty-one".