21202001109979 has 8 divisors (see below), whose sum is σ = 21933249822000. Its totient is φ = 20470762079712.

The previous prime is 21202001109941. The next prime is 21202001110001. The reversal of 21202001109979 is 97990110020212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21202001109979 - 2²¹ = 21201999012827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202001109479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2183317 + ... + 6868105.

It is an arithmetic number, because the mean of its divisors is an integer number (2741656227750).

Almost surely, 2^{21202001109979} is an apocalyptic number.

21202001109979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21202001109979 is a deficient number, since it is larger than the sum of its proper divisors (731248712021).

21202001109979 is a wasteful number, since it uses less digits than its factorization.

21202001109979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840877.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 21202001109979 in words is "twenty-one trillion, two hundred two billion, one million, one hundred nine thousand, nine hundred seventy-nine".