2145721340200 has 48 divisors (see below), whose sum is σ = 4989650848380. Its totient is φ = 858142517760.

The previous prime is 2145721340167. The next prime is 2145721340207. The reversal of 2145721340200 is 20431275412.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1053566756356 + 1092154583844 = 1026434^2 + 1045062^2 .

It is not an unprimeable number, because it can be changed into a prime (2145721340207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269734 + ... + 2089066.

Almost surely, 2^{2145721340200} is an apocalyptic number.

2145721340200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145721340200 is an abundant number, since it is smaller than the sum of its proper divisors (2843929508180).

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

2145721340200 is a wasteful number, since it uses less digits than its factorization.

2145721340200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825246 (or 1825237 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 2145721340200 in words is "two trillion, one hundred forty-five billion, seven hundred twenty-one million, three hundred forty thousand, two hundred".