120121221000 has 128 divisors (see below), whose sum is σ = 408849068160. Its totient is φ = 29120288000.

The previous prime is 120121220971. The next prime is 120121221037. The reversal of 120121221000 is 122121021.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1787019 + ... + 1853018.

It is an arithmetic number, because the mean of its divisors is an integer number (3194133345).

Almost surely, 2^120121221000 is an apocalyptic number.

120121221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120121221000 is an abundant number, since it is smaller than the sum of its proper divisors (288727847160).

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

120121221000 is a wasteful number, since it uses less digits than its factorization.

120121221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640072 (or 3640058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 120121221000 its reverse (122121021), we get a palindrome (120243342021).

The spelling of 120121221000 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand".