21975432107 has 2 divisors, whose sum is σ = 21975432108. Its totient is φ = 21975432106.

The previous prime is 21975432077. The next prime is 21975432187. The reversal of 21975432107 is 70123457912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21975432107 - 2⁸ = 21975431851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21975432187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10987716053 + 10987716054.

It is an arithmetic number, because the mean of its divisors is an integer number (10987716054).

Almost surely, 2^21975432107 is an apocalyptic number.

21975432107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21975432107 is an equidigital number, since it uses as much as digits as its factorization.

21975432107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 21975432107 in words is "twenty-one billion, nine hundred seventy-five million, four hundred thirty-two thousand, one hundred seven".