21214203979 has 2 divisors, whose sum is σ = 21214203980. Its totient is φ = 21214203978.

The previous prime is 21214203973. The next prime is 21214204009. The reversal of 21214203979 is 97930241212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21214203979 - 2⁷ = 21214203851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21214203973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607101989 + 10607101990.

It is an arithmetic number, because the mean of its divisors is an integer number (10607101990).

Almost surely, 2^21214203979 is an apocalyptic number.

21214203979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214203979 is an equidigital number, since it uses as much as digits as its factorization.

21214203979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 21214203979 in words is "twenty-one billion, two hundred fourteen million, two hundred three thousand, nine hundred seventy-nine".