1221145045250 has 64 divisors (see below), whose sum is σ = 2472869468160. Its totient is φ = 448862155200.

The previous prime is 1221145045247. The next prime is 1221145045339. The reversal of 1221145045250 is 525405411221.

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 31 ways as a sum of consecutive naturals, for example, 117710 + ... + 1567209.

It is an arithmetic number, because the mean of its divisors is an integer number (38638585440).

Almost surely, 2^{1221145045250} is an apocalyptic number.

1221145045250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221145045250 is an abundant number, since it is smaller than the sum of its proper divisors (1251724422910).

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

1221145045250 is a wasteful number, since it uses less digits than its factorization.

1221145045250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685172 (or 1685162 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 1221145045250 in words is "one trillion, two hundred twenty-one billion, one hundred forty-five million, forty-five thousand, two hundred fifty".