21001202220979 has 2 divisors, whose sum is σ = 21001202220980. Its totient is φ = 21001202220978.

The previous prime is 21001202220953. The next prime is 21001202221007. The reversal of 21001202220979 is 97902220210012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001202220979 - 2¹³ = 21001202212787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001202224979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500601110489 + 10500601110490.

It is an arithmetic number, because the mean of its divisors is an integer number (10500601110490).

Almost surely, 2^{21001202220979} is an apocalyptic number.

21001202220979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001202220979 is an equidigital number, since it uses as much as digits as its factorization.

21001202220979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 21001202220979 in words is "twenty-one trillion, one billion, two hundred two million, two hundred twenty thousand, nine hundred seventy-nine".