1212156960400 has 45 divisors (see below), whose sum is σ = 2912260000411. Its totient is φ = 484853976320.

The previous prime is 1212156960323. The next prime is 1212156960401. The reversal of 1212156960400 is 40696512121.

The square root of 1212156960400 is 1100980.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 137899337104 + 1074257623296 = 371348^2 + 1036464^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212156960400.

It is not an unprimeable number, because it can be changed into a prime (1212156960401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21992076 + ... + 22047124.

Almost surely, 2^{1212156960400} is an apocalyptic number.

1212156960400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212156960400 is the 1100980-th square number.

It is an amenable number.

1212156960400 is an abundant number, since it is smaller than the sum of its proper divisors (1700103040011).

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

1212156960400 is an frugal number, since it uses more digits than its factorization.

1212156960400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110116 (or 55056 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 1212156960400 in words is "one trillion, two hundred twelve billion, one hundred fifty-six million, nine hundred sixty thousand, four hundred".