2121201019979 has 8 divisors (see below), whose sum is σ = 2246045045328. Its totient is φ = 1996364494080.

The previous prime is 2121201019921. The next prime is 2121201020023. The reversal of 2121201019979 is 9799101021212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121201019979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121201019079) 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, 1287257 + ... + 2428874.

It is an arithmetic number, because the mean of its divisors is an integer number (280755630666).

Almost surely, 2^{2121201019979} is an apocalyptic number.

2121201019979 is a deficient number, since it is larger than the sum of its proper divisors (124844025349).

2121201019979 is a wasteful number, since it uses less digits than its factorization.

2121201019979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749725.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 2121201019979 in words is "two trillion, one hundred twenty-one billion, two hundred one million, nineteen thousand, nine hundred seventy-nine".