1211948359920 has 120 divisors (see below), whose sum is σ = 4121647358400. Its totient is φ = 319095249408.

The previous prime is 1211948359903. The next prime is 1211948359939. The reversal of 1211948359920 is 299538491121.

It is a happy number.

1211948359920 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 9 + 48 + 3 + 599 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1211948359920² (a number of 25 digits) contains 22 as substring.

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, 10596675 + ... + 10710434.

It is an arithmetic number, because the mean of its divisors is an integer number (34347061320).

Almost surely, 2^{1211948359920} is an apocalyptic number.

1211948359920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211948359920 is an abundant number, since it is smaller than the sum of its proper divisors (2909698998480).

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

1211948359920 is a wasteful number, since it uses less digits than its factorization.

1211948359920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21307207 (or 21307198 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 1211948359920 in words is "one trillion, two hundred eleven billion, nine hundred forty-eight million, three hundred fifty-nine thousand, nine hundred twenty".