2021112109978 has 16 divisors (see below), whose sum is σ = 3370191906816. Its totient is φ = 902729974320.

The previous prime is 2021112109879. The next prime is 2021112109981. The reversal of 2021112109978 is 8799012111202.

It is a happy number.

It is a super-2 number, since 2×2021112109978² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253790826 + ... + 1253792437.

It is an arithmetic number, because the mean of its divisors is an integer number (210636994176).

Almost surely, 2^{2021112109978} is an apocalyptic number.

2021112109978 is a deficient number, since it is larger than the sum of its proper divisors (1349079796838).

2021112109978 is a wasteful number, since it uses less digits than its factorization.

2021112109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507583309.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 2021112109978 in words is "two trillion, twenty-one billion, one hundred twelve million, one hundred nine thousand, nine hundred seventy-eight".