21410524721 has 2 divisors, whose sum is σ = 21410524722. Its totient is φ = 21410524720.

The previous prime is 21410524711. The next prime is 21410524739. The reversal of 21410524721 is 12742501412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20330482225 + 1080042496 = 142585^2 + 32864^2 .

It is a cyclic number.

It is not a de Polignac number, because 21410524721 - 2¹⁰ = 21410523697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21410524711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705262360 + 10705262361.

It is an arithmetic number, because the mean of its divisors is an integer number (10705262361).

Almost surely, 2^21410524721 is an apocalyptic number.

It is an amenable number.

21410524721 is a deficient number, since it is larger than the sum of its proper divisors (1).

21410524721 is an equidigital number, since it uses as much as digits as its factorization.

21410524721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 29.

The spelling of 21410524721 in words is "twenty-one billion, four hundred ten million, five hundred twenty-four thousand, seven hundred twenty-one".