21132211987 has 2 divisors, whose sum is σ = 21132211988. Its totient is φ = 21132211986.

The previous prime is 21132211979. The next prime is 21132212009. The reversal of 21132211987 is 78911223112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132211987 - 2³ = 21132211979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21132211687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566105993 + 10566105994.

It is an arithmetic number, because the mean of its divisors is an integer number (10566105994).

Almost surely, 2^21132211987 is an apocalyptic number.

21132211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132211987 is an equidigital number, since it uses as much as digits as its factorization.

21132211987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The spelling of 21132211987 in words is "twenty-one billion, one hundred thirty-two million, two hundred eleven thousand, nine hundred eighty-seven".