100211221221 has 32 divisors (see below), whose sum is σ = 138623643648. Its totient is φ = 64351519680.

The previous prime is 100211221199. The next prime is 100211221247. The reversal of 100211221221 is 122122112001.

It is not a de Polignac number, because 100211221221 - 2⁶ = 100211221157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100211221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211221321) 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, 5867931 + ... + 5884983.

It is an arithmetic number, because the mean of its divisors is an integer number (4331988864).

Almost surely, 2^100211221221 is an apocalyptic number.

It is an amenable number.

100211221221 is a deficient number, since it is larger than the sum of its proper divisors (38412422427).

100211221221 is a wasteful number, since it uses less digits than its factorization.

100211221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17761.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 100211221221 its reverse (122122112001), we get a palindrome (222333333222).

The spelling of 100211221221 in words is "one hundred billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".