1221200000250 has 64 divisors (see below), whose sum is σ = 3056074444800. Its totient is φ = 324802987200.

The previous prime is 1221200000249. The next prime is 1221200000269. The reversal of 1221200000250 is 520000021221.

It is a super-2 number, since 2×1221200000250² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 1838425 + ... + 2412924.

It is an arithmetic number, because the mean of its divisors is an integer number (47751163200).

Almost surely, 2^{1221200000250} is an apocalyptic number.

1221200000250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221200000250 is an abundant number, since it is smaller than the sum of its proper divisors (1834874444550).

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

1221200000250 is a wasteful number, since it uses less digits than its factorization.

1221200000250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251752 (or 4251742 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 1221200000250 its reverse (520000021221), we get a palindrome (1741200021471).

The spelling of 1221200000250 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred fifty", and thus it is an aban number.