121221211250 has 40 divisors (see below), whose sum is σ = 239175876720. Its totient is φ = 45936450000.

The previous prime is 121221211249. The next prime is 121221211271. The reversal of 121221211250 is 52112122121.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2528276 + ... + 2575775.

It is an arithmetic number, because the mean of its divisors is an integer number (5979396918).

Almost surely, 2^121221211250 is an apocalyptic number.

121221211250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221211250 is a deficient number, since it is larger than the sum of its proper divisors (117954665470).

121221211250 is an equidigital number, since it uses as much as digits as its factorization.

121221211250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104092 (or 5104077 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 121221211250 its reverse (52112122121), we get a palindrome (173333333371).

The spelling of 121221211250 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred fifty".