121012223100 has 144 divisors (see below), whose sum is σ = 365486607360. Its totient is φ = 30877862400.

The previous prime is 121012223083. The next prime is 121012223183. The reversal of 121012223100 is 1322210121.

It is a super-2 number, since 2×121012223100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121012223100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 754599 + ... + 900801.

It is an arithmetic number, because the mean of its divisors is an integer number (2538101440).

Almost surely, 2^121012223100 is an apocalyptic number.

121012223100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121012223100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182743303680).

121012223100 is an abundant number, since it is smaller than the sum of its proper divisors (244474384260).

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

121012223100 is a wasteful number, since it uses less digits than its factorization.

121012223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146340 (or 146333 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121012223100 its reverse (1322210121), we get a palindrome (122334433221).

The spelling of 121012223100 in words is "one hundred twenty-one billion, twelve million, two hundred twenty-three thousand, one hundred".