21224124552 has 64 divisors (see below), whose sum is σ = 56034478080. Its totient is φ = 6685566272.

The previous prime is 21224124533. The next prime is 21224124563. The reversal of 21224124552 is 25542142212.

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, 185808 + ... + 277439.

It is an arithmetic number, because the mean of its divisors is an integer number (875538720).

Almost surely, 2^21224124552 is an apocalyptic number.

It is an amenable number.

21224124552 is an abundant number, since it is smaller than the sum of its proper divisors (34810353528).

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

21224124552 is a wasteful number, since it uses less digits than its factorization.

21224124552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463362 (or 463358 counting only the distinct ones).

The product of its digits is 12800, while the sum is 30.

Adding to 21224124552 its reverse (25542142212), we get a palindrome (46766266764).

The spelling of 21224124552 in words is "twenty-one billion, two hundred twenty-four million, one hundred twenty-four thousand, five hundred fifty-two".