21503143232 has 28 divisors (see below), whose sum is σ = 42827789376. Its totient is φ = 10711889280.

The previous prime is 21503143229. The next prime is 21503143237. The reversal of 21503143232 is 23234130512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21503143237) 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, 602558 + ... + 637245.

Almost surely, 2^21503143232 is an apocalyptic number.

It is an amenable number.

21503143232 is a deficient number, since it is larger than the sum of its proper divisors (21324646144).

21503143232 is a wasteful number, since it uses less digits than its factorization.

21503143232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240086 (or 1240076 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21503143232 its reverse (23234130512), we get a palindrome (44737273744).

The spelling of 21503143232 in words is "twenty-one billion, five hundred three million, one hundred forty-three thousand, two hundred thirty-two".