2151240140 has 72 divisors (see below), whose sum is σ = 5483715552. Its totient is φ = 705492480.

The previous prime is 2151240127. The next prime is 2151240151. The reversal of 2151240140 is 410421512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 25181 + ... + 70260.

It is an arithmetic number, because the mean of its divisors is an integer number (76162716).

Almost surely, 2^2151240140 is an apocalyptic number.

2151240140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151240140 is an abundant number, since it is smaller than the sum of its proper divisors (3332475412).

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

2151240140 is a wasteful number, since it uses less digits than its factorization.

2151240140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95487 (or 95478 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2151240140 is about 46381.4633231855. The cubic root of 2151240140 is about 1290.9109884284.

Adding to 2151240140 its reverse (410421512), we get a palindrome (2561661652).

The spelling of 2151240140 in words is "two billion, one hundred fifty-one million, two hundred forty thousand, one hundred forty".