121222212100 has 144 divisors (see below), whose sum is σ = 291898567296. Its totient is φ = 43326976000.

The previous prime is 121222212053. The next prime is 121222212131. The reversal of 121222212100 is 1212222121.

It is a happy 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, 27567102 + ... + 27571498.

It is an arithmetic number, because the mean of its divisors is an integer number (2027073384).

Almost surely, 2^121222212100 is an apocalyptic number.

121222212100 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 121222212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145949283648).

121222212100 is an abundant number, since it is smaller than the sum of its proper divisors (170676355196).

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

121222212100 is a wasteful number, since it uses less digits than its factorization.

121222212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846 (or 4839 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121222212100 its reverse (1212222121), we get a palindrome (122434434221).

121222212100 divided by its reverse (1212222121) gives a square (100 = 10²).

It can be divided in two parts, 12122 and 2212100, that added together give a palindrome (2224222).

The spelling of 121222212100 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred".