100021021221 has 32 divisors (see below), whose sum is σ = 148231922688. Its totient is φ = 59481354240.

The previous prime is 100021021213. The next prime is 100021021229. The reversal of 100021021221 is 122120120001.

It is an interprime number because it is at equal distance from previous prime (100021021213) and next prime (100021021229).

It is not a de Polignac number, because 100021021221 - 2³ = 100021021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021021197 and 100021021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021021229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 480216 + ... + 656238.

It is an arithmetic number, because the mean of its divisors is an integer number (4632247584).

Almost surely, 2^100021021221 is an apocalyptic number.

100021021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100021021221 is a deficient number, since it is larger than the sum of its proper divisors (48210901467).

100021021221 is a wasteful number, since it uses less digits than its factorization.

100021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176361.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 100021021221 its reverse (122120120001), we get a palindrome (222141141222).

The spelling of 100021021221 in words is "one hundred billion, twenty-one million, twenty-one thousand, two hundred twenty-one".