21003231532 has 6 divisors (see below), whose sum is σ = 36755655188. Its totient is φ = 10501615764.

The previous prime is 21003231521. The next prime is 21003231539. The reversal of 21003231532 is 23513230012.

It is a super-2 number, since 2×21003231532² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003231539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625403938 + ... + 2625403945.

Almost surely, 2^21003231532 is an apocalyptic number.

It is an amenable number.

21003231532 is a deficient number, since it is larger than the sum of its proper divisors (15752423656).

21003231532 is a wasteful number, since it uses less digits than its factorization.

21003231532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250807887 (or 5250807885 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21003231532 its reverse (23513230012), we get a palindrome (44516461544).

The spelling of 21003231532 in words is "twenty-one billion, three million, two hundred thirty-one thousand, five hundred thirty-two".