2151215730 has 48 divisors (see below), whose sum is σ = 5600963160. Its totient is φ = 572857344.

The previous prime is 2151215711. The next prime is 2151215747. The reversal of 2151215730 is 375121512.

2151215730 is a `hidden beast` number, since 21 + 51 + 21 + 573 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2143041849 + 8173881 = 46293^2 + 2859^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2151215694 and 2151215703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49666 + ... + 82274.

Almost surely, 2^2151215730 is an apocalyptic number.

2151215730 is an abundant number, since it is smaller than the sum of its proper divisors (3449747430).

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

2151215730 is a wasteful number, since it uses less digits than its factorization.

2151215730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33355 (or 33352 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 2151215730 is about 46381.2001785206. The cubic root of 2151215730 is about 1290.9061057787.

The spelling of 2151215730 in words is "two billion, one hundred fifty-one million, two hundred fifteen thousand, seven hundred thirty".