21403432552 has 32 divisors (see below), whose sum is σ = 41884490880. Its totient is φ = 10234417600.

The previous prime is 21403432541. The next prime is 21403432553. The reversal of 21403432552 is 25523430412.

It is not an unprimeable number, because it can be changed into a prime (21403432553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1409802 + ... + 1424902.

It is an arithmetic number, because the mean of its divisors is an integer number (1308890340).

Almost surely, 2^21403432552 is an apocalyptic number.

It is an amenable number.

21403432552 is a deficient number, since it is larger than the sum of its proper divisors (20481058328).

21403432552 is a wasteful number, since it uses less digits than its factorization.

21403432552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22833 (or 22829 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21403432552 its reverse (25523430412), we get a palindrome (46926862964).

The spelling of 21403432552 in words is "twenty-one billion, four hundred three million, four hundred thirty-two thousand, five hundred fifty-two".