21532040639 has 2 divisors, whose sum is σ = 21532040640. Its totient is φ = 21532040638.

The previous prime is 21532040597. The next prime is 21532040687. The reversal of 21532040639 is 93604023512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21532040639 - 2¹⁶ = 21531975103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21532040599 and 21532040608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21532040689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766020319 + 10766020320.

It is an arithmetic number, because the mean of its divisors is an integer number (10766020320).

Almost surely, 2^21532040639 is an apocalyptic number.

21532040639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21532040639 is an equidigital number, since it uses as much as digits as its factorization.

21532040639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 21532040639 in words is "twenty-one billion, five hundred thirty-two million, forty thousand, six hundred thirty-nine".