100211331221 has 4 divisors (see below), whose sum is σ = 100298245932. Its totient is φ = 100124416512.

The previous prime is 100211331211. The next prime is 100211331239. The reversal of 100211331221 is 122133112001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122133112001 = 71693 ⋅1703557.

It can be written as a sum of positive squares in 2 ways, for example, as 78126399121 + 22084932100 = 279511^2 + 148610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100211331221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100211331221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211331211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43455626 + ... + 43457931.

It is an arithmetic number, because the mean of its divisors is an integer number (25074561483).

Almost surely, 2^100211331221 is an apocalyptic number.

It is an amenable number.

100211331221 is a deficient number, since it is larger than the sum of its proper divisors (86914711).

100211331221 is an equidigital number, since it uses as much as digits as its factorization.

100211331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86914710.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 100211331221 its reverse (122133112001), we get a palindrome (222344443222).

The spelling of 100211331221 in words is "one hundred billion, two hundred eleven million, three hundred thirty-one thousand, two hundred twenty-one".