121221221320 has 64 divisors (see below), whose sum is σ = 291388132800. Its totient is φ = 45250824960.

The previous prime is 121221221299. The next prime is 121221221351. The reversal of 121221221320 is 23122122121.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 15 ways as a sum of consecutive naturals, for example, 1139391 + ... + 1241230.

It is an arithmetic number, because the mean of its divisors is an integer number (4552939575).

Almost surely, 2^121221221320 is an apocalyptic number.

121221221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221221320 is an abundant number, since it is smaller than the sum of its proper divisors (170166911480).

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

121221221320 is a wasteful number, since it uses less digits than its factorization.

121221221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380718 (or 2380714 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 121221221320 its reverse (23122122121), we get a palindrome (144343343441).

The spelling of 121221221320 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, three hundred twenty".