121131221000 has 32 divisors (see below), whose sum is σ = 283447059480. Its totient is φ = 48452488000.

The previous prime is 121131220967. The next prime is 121131221017. The reversal of 121131221000 is 122131121.

It can be written as a sum of positive squares in 4 ways, for example, as 72478331524 + 48652889476 = 269218^2 + 220574^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60564611 + ... + 60566610.

Almost surely, 2^121131221000 is an apocalyptic number.

121131221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131221000 is an abundant number, since it is smaller than the sum of its proper divisors (162315838480).

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

121131221000 is a wasteful number, since it uses less digits than its factorization.

121131221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121131242 (or 121131228 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 121131221000 its reverse (122131121), we get a palindrome (121253352121).

The spelling of 121131221000 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-one thousand".