100111210111221 has 32 divisors (see below), whose sum is σ = 137271599216640. Its totient is φ = 64858640457600.

The previous prime is 100111210111207. The next prime is 100111210111229. The reversal of 100111210111221 is 122111012111001.

It is not a de Polignac number, because 100111210111221 - 2⁴¹ = 97912186855669 is a prime.

It is a super-2 number, since 2×100111210111221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100111210111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100111210111229) 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, 154441690 + ... + 155088548.

It is an arithmetic number, because the mean of its divisors is an integer number (4289737475520).

Almost surely, 2^{100111210111221} is an apocalyptic number.

It is an amenable number.

100111210111221 is a deficient number, since it is larger than the sum of its proper divisors (37160389105419).

100111210111221 is a wasteful number, since it uses less digits than its factorization.

100111210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651817.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 100111210111221 its reverse (122111012111001), we get a palindrome (222222222222222).

The spelling of 100111210111221 in words is "one hundred trillion, one hundred eleven billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".