100021221001 has 16 divisors (see below), whose sum is σ = 111061621440. Its totient is φ = 89491671360.

The previous prime is 100021220983. The next prime is 100021221017. The reversal of 100021221001 is 100122120001.

It is not a de Polignac number, because 100021221001 - 2²⁷ = 99887003273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021221071) 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, 609706 + ... + 756163.

It is an arithmetic number, because the mean of its divisors is an integer number (6941351340).

Almost surely, 2^100021221001 is an apocalyptic number.

It is an amenable number.

100021221001 is a deficient number, since it is larger than the sum of its proper divisors (11040400439).

100021221001 is a wasteful number, since it uses less digits than its factorization.

100021221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366056.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100021221001 its reverse (100122120001), we get a palindrome (200143341002).

The spelling of 100021221001 in words is "one hundred billion, twenty-one million, two hundred twenty-one thousand, one".