21216350151979 has 2 divisors, whose sum is σ = 21216350151980. Its totient is φ = 21216350151978.

The previous prime is 21216350151947. The next prime is 21216350152013. The reversal of 21216350151979 is 97915105361212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21216350151979 - 2⁵ = 21216350151947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21216350152979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10608175075989 + 10608175075990.

It is an arithmetic number, because the mean of its divisors is an integer number (10608175075990).

Almost surely, 2^{21216350151979} is an apocalyptic number.

21216350151979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21216350151979 is an equidigital number, since it uses as much as digits as its factorization.

21216350151979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The spelling of 21216350151979 in words is "twenty-one trillion, two hundred sixteen billion, three hundred fifty million, one hundred fifty-one thousand, nine hundred seventy-nine".