2151232040 has 64 divisors (see below), whose sum is σ = 4948862400. Its totient is φ = 841347072.

The previous prime is 2151232033. The next prime is 2151232049. The reversal of 2151232040 is 402321512.

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

It is not an unprimeable number, because it can be changed into a prime (2151232049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453119 + ... + 457841.

It is an arithmetic number, because the mean of its divisors is an integer number (77325975).

Almost surely, 2^2151232040 is an apocalyptic number.

2151232040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151232040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2474431200).

2151232040 is an abundant number, since it is smaller than the sum of its proper divisors (2797630360).

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

2151232040 is a wasteful number, since it uses less digits than its factorization.

2151232040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986 (or 4982 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2151232040 is about 46381.3760037367. The cubic root of 2151232040 is about 1290.9093682169.

Adding to 2151232040 its reverse (402321512), we get a palindrome (2553553552).

The spelling of 2151232040 in words is "two billion, one hundred fifty-one million, two hundred thirty-two thousand, forty".