10201021978 has 24 divisors (see below), whose sum is σ = 17966113632. Its totient is φ = 4331003544.

The previous prime is 10201021973. The next prime is 10201021979. The reversal of 10201021978 is 87912010201.

It is not an unprimeable number, because it can be changed into a prime (10201021973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475926 + ... + 496897.

It is an arithmetic number, because the mean of its divisors is an integer number (748588068).

Almost surely, 2^10201021978 is an apocalyptic number.

10201021978 is a deficient number, since it is larger than the sum of its proper divisors (7765091654).

10201021978 is a wasteful number, since it uses less digits than its factorization.

10201021978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972946 (or 972939 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 10201021978 in words is "ten billion, two hundred one million, twenty-one thousand, nine hundred seventy-eight".