121111212102 has 64 divisors (see below), whose sum is σ = 255346297344. Its totient is φ = 38220765440.

The previous prime is 121111212091. The next prime is 121111212107. The reversal of 121111212102 is 201212111121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111212107) 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, 6551152 + ... + 6569612.

It is an arithmetic number, because the mean of its divisors is an integer number (3989785896).

Almost surely, 2^121111212102 is an apocalyptic number.

121111212102 is an abundant number, since it is smaller than the sum of its proper divisors (134235085242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121111212102 is a wasteful number, since it uses less digits than its factorization.

121111212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18973.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121111212102 its reverse (201212111121), we get a palindrome (322323323223).

The spelling of 121111212102 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, one hundred two".