111101202121 has 48 divisors (see below), whose sum is σ = 138997231744. Its totient is φ = 86471110656.

The previous prime is 111101202109. The next prime is 111101202131. The reversal of 111101202121 is 121202101111.

It is a happy number.

It is not a de Polignac number, because 111101202121 - 2⁵ = 111101202089 is a prime.

It is a super-2 number, since 2×111101202121² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101202101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 563965395 + ... + 563965591.

Almost surely, 2^111101202121 is an apocalyptic number.

It is an amenable number.

111101202121 is a deficient number, since it is larger than the sum of its proper divisors (27896029623).

111101202121 is a wasteful number, since it uses less digits than its factorization.

111101202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111101202121 its reverse (121202101111), we get a palindrome (232303303232).

The spelling of 111101202121 in words is "one hundred eleven billion, one hundred one million, two hundred two thousand, one hundred twenty-one".