21500454332 has 48 divisors (see below), whose sum is σ = 43448401920. Its totient is φ = 9118956672.

The previous prime is 21500454329. The next prime is 21500454341. The reversal of 21500454332 is 23345400512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21500454295 and 21500454304.

It is a congruent number.

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, 1447013 + ... + 1461795.

It is an arithmetic number, because the mean of its divisors is an integer number (905175040).

Almost surely, 2^21500454332 is an apocalyptic number.

It is an amenable number.

21500454332 is an abundant number, since it is smaller than the sum of its proper divisors (21947947588).

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

21500454332 is a wasteful number, since it uses less digits than its factorization.

21500454332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15330 (or 15328 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21500454332 its reverse (23345400512), we get a palindrome (44845854844).

The spelling of 21500454332 in words is "twenty-one billion, five hundred million, four hundred fifty-four thousand, three hundred thirty-two".