20212099979 has 2 divisors, whose sum is σ = 20212099980. Its totient is φ = 20212099978.

The previous prime is 20212099967. The next prime is 20212100039. The reversal of 20212099979 is 97999021202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20212099979 - 2²⁸ = 19943664523 is a prime.

It is a super-2 number, since 2×20212099979² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20212099079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106049989 + 10106049990.

It is an arithmetic number, because the mean of its divisors is an integer number (10106049990).

Almost surely, 2^20212099979 is an apocalyptic number.

20212099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212099979 is an equidigital number, since it uses as much as digits as its factorization.

20212099979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 50.

The spelling of 20212099979 in words is "twenty billion, two hundred twelve million, ninety-nine thousand, nine hundred seventy-nine".