21234132472 has 32 divisors (see below), whose sum is σ = 48178285920. Its totient is φ = 8565027840.

The previous prime is 21234132463. The next prime is 21234132487. The reversal of 21234132472 is 27423143212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11151429 + ... + 11153332.

It is an arithmetic number, because the mean of its divisors is an integer number (1505571435).

Almost surely, 2^21234132472 is an apocalyptic number.

It is an amenable number.

21234132472 is an abundant number, since it is smaller than the sum of its proper divisors (26944153448).

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

21234132472 is a wasteful number, since it uses less digits than its factorization.

21234132472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22304791 (or 22304787 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

Adding to 21234132472 its reverse (27423143212), we get a palindrome (48657275684).

The spelling of 21234132472 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-two thousand, four hundred seventy-two".