2311111212102 has 72 divisors (see below), whose sum is σ = 6290297224848. Its totient is φ = 600288622560.

The previous prime is 2311111212079. The next prime is 2311111212181. The reversal of 2311111212102 is 2012121111132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75778773 + ... + 75809264.

It is an arithmetic number, because the mean of its divisors is an integer number (87365239234).

Almost surely, 2^{2311111212102} is an apocalyptic number.

2311111212102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2311111212102 is an abundant number, since it is smaller than the sum of its proper divisors (3979186012746).

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

2311111212102 is a wasteful number, since it uses less digits than its factorization.

2311111212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151588074 (or 151588060 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 2311111212102 its reverse (2012121111132), we get a palindrome (4323232323234).

The spelling of 2311111212102 in words is "two trillion, three hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred two".