100021021028 has 24 divisors (see below), whose sum is σ = 178371002880. Its totient is φ = 49058212320.

The previous prime is 100021021021. The next prime is 100021021063. The reversal of 100021021028 is 820120120001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 100021020997 and 100021021015.

It is not an unprimeable number, because it can be changed into a prime (100021021021) 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, 1249943 + ... + 1327553.

It is an arithmetic number, because the mean of its divisors is an integer number (7432125120).

Almost surely, 2^100021021028 is an apocalyptic number.

It is an amenable number.

100021021028 is a deficient number, since it is larger than the sum of its proper divisors (78349981852).

100021021028 is a wasteful number, since it uses less digits than its factorization.

100021021028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83747 (or 83745 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 100021021028 its reverse (820120120001), we get a palindrome (920141141029).

The spelling of 100021021028 in words is "one hundred billion, twenty-one million, twenty-one thousand, twenty-eight".