21232032002921 has 2 divisors, whose sum is σ = 21232032002922. Its totient is φ = 21232032002920.

The previous prime is 21232032002917. The next prime is 21232032002927. The reversal of 21232032002921 is 12920023023212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21118951127296 + 113080875625 = 4595536^2 + 336275^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232032002921 - 2² = 21232032002917 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232032002927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616016001460 + 10616016001461.

It is an arithmetic number, because the mean of its divisors is an integer number (10616016001461).

Almost surely, 2^{21232032002921} is an apocalyptic number.

It is an amenable number.

21232032002921 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232032002921 is an equidigital number, since it uses as much as digits as its factorization.

21232032002921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21232032002921 in words is "twenty-one trillion, two hundred thirty-two billion, thirty-two million, two thousand, nine hundred twenty-one".