2021011209978 has 32 divisors (see below), whose sum is σ = 4162577789184. Its totient is φ = 653677065792.

The previous prime is 2021011209929. The next prime is 2021011209989. The reversal of 2021011209978 is 8799021101202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12321325 + ... + 12484272.

It is an arithmetic number, because the mean of its divisors is an integer number (130080555912).

Almost surely, 2^{2021011209978} is an apocalyptic number.

2021011209978 is an abundant number, since it is smaller than the sum of its proper divisors (2141566579206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021011209978 is a wasteful number, since it uses less digits than its factorization.

2021011209978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24806006.

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 2021011209978 in words is "two trillion, twenty-one billion, eleven million, two hundred nine thousand, nine hundred seventy-eight".