21232501240 has 32 divisors (see below), whose sum is σ = 47777860080. Its totient is φ = 8492159232.

The previous prime is 21232501231. The next prime is 21232501289. The reversal of 21232501240 is 4210523212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525604 + ... + 564556.

Almost surely, 2^21232501240 is an apocalyptic number.

21232501240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232501240 is an abundant number, since it is smaller than the sum of its proper divisors (26545358840).

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

21232501240 is a wasteful number, since it uses less digits than its factorization.

21232501240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52591 (or 52587 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 21232501240 in words is "twenty-one billion, two hundred thirty-two million, five hundred one thousand, two hundred forty".