111121211110 has 128 divisors (see below), whose sum is σ = 260866013184. Its totient is φ = 33072814080.

The previous prime is 111121211101. The next prime is 111121211137. The reversal of 111121211110 is 11112121111.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28323609 + ... + 28327531.

It is an arithmetic number, because the mean of its divisors is an integer number (2038015728).

Almost surely, 2^111121211110 is an apocalyptic number.

111121211110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111121211110 is an abundant number, since it is smaller than the sum of its proper divisors (149744802074).

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

111121211110 is a wasteful number, since it uses less digits than its factorization.

111121211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5798.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111121211110 its reverse (11112121111), we get a palindrome (122233332221).

The spelling of 111121211110 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, one hundred ten".