2151220540 has 48 divisors (see below), whose sum is σ = 5268312000. Its totient is φ = 737558976.

The previous prime is 2151220433. The next prime is 2151220549. The reversal of 2151220540 is 450221512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151220549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149935 + ... + 163654.

It is an arithmetic number, because the mean of its divisors is an integer number (109756500).

Almost surely, 2^2151220540 is an apocalyptic number.

2151220540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151220540 is an abundant number, since it is smaller than the sum of its proper divisors (3117091460).

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

2151220540 is a wasteful number, since it uses less digits than its factorization.

2151220540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313619 (or 313603 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2151220540 is about 46381.2520313973. The cubic root of 2151220540 is about 1290.9070679096.

The spelling of 2151220540 in words is "two billion, one hundred fifty-one million, two hundred twenty thousand, five hundred forty".