1221350159900 has 36 divisors (see below), whose sum is σ = 2854201376712. Its totient is φ = 450960058560.

The previous prime is 1221350159899. The next prime is 1221350159917. The reversal of 1221350159900 is 99510531221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469748762 + ... + 469751361.

Almost surely, 2^{1221350159900} is an apocalyptic number.

1221350159900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221350159900 is an abundant number, since it is smaller than the sum of its proper divisors (1632851216812).

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

1221350159900 is a wasteful number, since it uses less digits than its factorization.

1221350159900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939500150 (or 939500143 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 38.

The spelling of 1221350159900 in words is "one trillion, two hundred twenty-one billion, three hundred fifty million, one hundred fifty-nine thousand, nine hundred".