2851221240 has 96 divisors (see below), whose sum is σ = 10590259680. Its totient is φ = 651707136.

The previous prime is 2851221223. The next prime is 2851221251. The reversal of 2851221240 is 421221582.

2851221240 is a `hidden beast` number, since 28 + 512 + 2 + 124 + 0 = 666.

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, 563199 + ... + 568238.

It is an arithmetic number, because the mean of its divisors is an integer number (110315205).

Almost surely, 2^2851221240 is an apocalyptic number.

2851221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2851221240 is an abundant number, since it is smaller than the sum of its proper divisors (7739038440).

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

2851221240 is a wasteful number, since it uses less digits than its factorization.

2851221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131461 (or 1131454 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 2851221240 is about 53396.8279956778. The cubic root of 2851221240 is about 1418.0024216775.

The spelling of 2851221240 in words is "two billion, eight hundred fifty-one million, two hundred twenty-one thousand, two hundred forty".