2152121240 has 16 divisors (see below), whose sum is σ = 4842272880. Its totient is φ = 860848480.

The previous prime is 2152121183. The next prime is 2152121261. The reversal of 2152121240 is 421212512.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26901476 + ... + 26901555.

It is an arithmetic number, because the mean of its divisors is an integer number (302642055).

Almost surely, 2^2152121240 is an apocalyptic number.

2152121240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2152121240 is an abundant number, since it is smaller than the sum of its proper divisors (2690151640).

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

2152121240 is a wasteful number, since it uses less digits than its factorization.

2152121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53803042 (or 53803038 counting only the distinct ones).

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

The square root of 2152121240 is about 46390.9607574579. The cubic root of 2152121240 is about 1291.0872071590.

Adding to 2152121240 its reverse (421212512), we get a palindrome (2573333752).

The spelling of 2152121240 in words is "two billion, one hundred fifty-two million, one hundred twenty-one thousand, two hundred forty".