21032332691 has 2 divisors, whose sum is σ = 21032332692. Its totient is φ = 21032332690.

The previous prime is 21032332637. The next prime is 21032332709. The reversal of 21032332691 is 19623323012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21032332691 - 2¹⁸ = 21032070547 is a prime.

It is not a weakly prime, because it can be changed into another prime (21032332091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516166345 + 10516166346.

It is an arithmetic number, because the mean of its divisors is an integer number (10516166346).

Almost surely, 2^21032332691 is an apocalyptic number.

21032332691 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032332691 is an equidigital number, since it uses as much as digits as its factorization.

21032332691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 21032332691 in words is "twenty-one billion, thirty-two million, three hundred thirty-two thousand, six hundred ninety-one".