20231021978 has 32 divisors (see below), whose sum is σ = 31134257280. Its totient is φ = 9856440000.

The previous prime is 20231021977. The next prime is 20231022013. The reversal of 20231021978 is 87912013202.

It is not an unprimeable number, because it can be changed into a prime (20231021977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7717508 + ... + 7720128.

It is an arithmetic number, because the mean of its divisors is an integer number (972945540).

Almost surely, 2^20231021978 is an apocalyptic number.

20231021978 is a deficient number, since it is larger than the sum of its proper divisors (10903235302).

20231021978 is a wasteful number, since it uses less digits than its factorization.

20231021978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 20231021978 in words is "twenty billion, two hundred thirty-one million, twenty-one thousand, nine hundred seventy-eight".