21432013250 has 32 divisors (see below), whose sum is σ = 40146004080. Its totient is φ = 8567404800.

The previous prime is 21432013247. The next prime is 21432013333. The reversal of 21432013250 is 5231023412.

It can be written as a sum of positive squares in 8 ways, for example, as 2859481 + 21429153769 = 1691^2 + 146387^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383066 + ... + 435434.

Almost surely, 2^21432013250 is an apocalyptic number.

21432013250 is a deficient number, since it is larger than the sum of its proper divisors (18713990830).

21432013250 is a wasteful number, since it uses less digits than its factorization.

21432013250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54023 (or 54013 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 21432013250 its reverse (5231023412), we get a palindrome (26663036662).

The spelling of 21432013250 in words is "twenty-one billion, four hundred thirty-two million, thirteen thousand, two hundred fifty".