12121031100 has 72 divisors (see below), whose sum is σ = 35731931760. Its totient is φ = 3171284480.

The previous prime is 12121031099. The next prime is 12121031101. The reversal of 12121031100 is 113012121.

It is an interprime number because it is at equal distance from previous prime (12121031099) and next prime (12121031101).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121031101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 365265 + ... + 397064.

It is an arithmetic number, because the mean of its divisors is an integer number (496276830).

Almost surely, 2^12121031100 is an apocalyptic number.

12121031100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121031100 is an abundant number, since it is smaller than the sum of its proper divisors (23610900660).

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

12121031100 is a wasteful number, since it uses less digits than its factorization.

12121031100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762399 (or 762392 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 12121031100 its reverse (113012121), we get a palindrome (12234043221).

The spelling of 12121031100 in words is "twelve billion, one hundred twenty-one million, thirty-one thousand, one hundred".