100021212221 has 24 divisors (see below), whose sum is σ = 117000771840. Its totient is φ = 85255202592.

The previous prime is 100021212167. The next prime is 100021212281. The reversal of 100021212221 is 122212120001.

It is not a de Polignac number, because 100021212221 - 2³⁰ = 98947470397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100021212196 and 100021212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021212281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6448151 + ... + 6463643.

It is an arithmetic number, because the mean of its divisors is an integer number (4875032160).

Almost surely, 2^100021212221 is an apocalyptic number.

It is an amenable number.

100021212221 is a deficient number, since it is larger than the sum of its proper divisors (16979559619).

100021212221 is a wasteful number, since it uses less digits than its factorization.

100021212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16233 (or 16226 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100021212221 its reverse (122212120001), we get a palindrome (222233332222).

The spelling of 100021212221 in words is "one hundred billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".