121221221323100 has 18 divisors (see below), whose sum is σ = 263050050271344. Its totient is φ = 48488488529200.

The previous prime is 121221221323087. The next prime is 121221221323123. The reversal of 121221221323100 is 1323122122121.

It is a super-2 number, since 2×121221221323100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606106106516 + ... + 606106106715.

Almost surely, 2^{121221221323100} is an apocalyptic number.

121221221323100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221221323100 is an abundant number, since it is smaller than the sum of its proper divisors (141828828948244).

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

121221221323100 is a wasteful number, since it uses less digits than its factorization.

121221221323100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212212213245 (or 1212212213238 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 121221221323100 its reverse (1323122122121), we get a palindrome (122544343445221).

The spelling of 121221221323100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, one hundred".