2121240432 has 20 divisors (see below), whose sum is σ = 5479871240. Its totient is φ = 707080128.

The previous prime is 2121240431. The next prime is 2121240469. The reversal of 2121240432 is 2340421212.

It is a junction number, because it is equal to n+sod(n) for n = 2121240399 and 2121240408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121240431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22096207 + ... + 22096302.

It is an arithmetic number, because the mean of its divisors is an integer number (273993562).

Almost surely, 2^2121240432 is an apocalyptic number.

It is an amenable number.

2121240432 is an abundant number, since it is smaller than the sum of its proper divisors (3358630808).

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

2121240432 is a wasteful number, since it uses less digits than its factorization.

2121240432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44192520 (or 44192514 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2121240432 is about 46056.9259938177. The cubic root of 2121240432 is about 1284.8821588960.

Adding to 2121240432 its reverse (2340421212), we get a palindrome (4461661644).

The spelling of 2121240432 in words is "two billion, one hundred twenty-one million, two hundred forty thousand, four hundred thirty-two".