121221133332100 has 72 divisors (see below), whose sum is σ = 270460050448896. Its totient is φ = 47131247520000.

The previous prime is 121221133332097. The next prime is 121221133332107. The reversal of 121221133332100 is 1233331122121.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (121221133332107) 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, 53438956 + ... + 55661155.

It is an arithmetic number, because the mean of its divisors is an integer number (3756389589568).

Almost surely, 2^{121221133332100} is an apocalyptic number.

121221133332100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221133332100 is an abundant number, since it is smaller than the sum of its proper divisors (149238917116796).

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

121221133332100 is a wasteful number, since it uses less digits than its factorization.

121221133332100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109100437 (or 109100430 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 121221133332100 its reverse (1233331122121), we get a palindrome (122454464454221).

The spelling of 121221133332100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred thirty-three million, three hundred thirty-two thousand, one hundred".