20221209979 has 2 divisors, whose sum is σ = 20221209980. Its totient is φ = 20221209978.

The previous prime is 20221209973. The next prime is 20221210003. The reversal of 20221209979 is 97990212202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20221209979 - 2⁹ = 20221209467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20221209973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110604989 + 10110604990.

It is an arithmetic number, because the mean of its divisors is an integer number (10110604990).

Almost surely, 2^20221209979 is an apocalyptic number.

20221209979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221209979 is an equidigital number, since it uses as much as digits as its factorization.

20221209979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 20221209979 in words is "twenty billion, two hundred twenty-one million, two hundred nine thousand, nine hundred seventy-nine".