21532424100521 has 2 divisors, whose sum is σ = 21532424100522. Its totient is φ = 21532424100520.

The previous prime is 21532424100493. The next prime is 21532424100541. The reversal of 21532424100521 is 12500142423512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15778849507600 + 5753574592921 = 3972260^2 + 2398661^2 .

It is a cyclic number.

It is not a de Polignac number, because 21532424100521 - 2¹⁴ = 21532424084137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21532424100541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766212050260 + 10766212050261.

It is an arithmetic number, because the mean of its divisors is an integer number (10766212050261).

Almost surely, 2^{21532424100521} is an apocalyptic number.

It is an amenable number.

21532424100521 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532424100521 is an equidigital number, since it uses as much as digits as its factorization.

21532424100521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21532424100521 in words is "twenty-one trillion, five hundred thirty-two billion, four hundred twenty-four million, one hundred thousand, five hundred twenty-one".