1209120921300 has 72 divisors (see below), whose sum is σ = 3499853870016. Its totient is φ = 322297314560.

The previous prime is 1209120921233. The next prime is 1209120921311. The reversal of 1209120921300 is 31290219021.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124224 + ... + 1560023.

It is an arithmetic number, because the mean of its divisors is an integer number (48609081528).

Almost surely, 2^{1209120921300} is an apocalyptic number.

1209120921300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209120921300 is an abundant number, since it is smaller than the sum of its proper divisors (2290732948716).

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

1209120921300 is a wasteful number, since it uses less digits than its factorization.

1209120921300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686657 (or 1686650 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 1209120921300 in words is "one trillion, two hundred nine billion, one hundred twenty million, nine hundred twenty-one thousand, three hundred".