21255322452 has 48 divisors (see below), whose sum is σ = 61040929152. Its totient is φ = 5605799040.

The previous prime is 21255322423. The next prime is 21255322463. The reversal of 21255322452 is 25422355212.

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, 9731199 + ... + 9733382.

It is an arithmetic number, because the mean of its divisors is an integer number (1271686024).

Almost surely, 2^21255322452 is an apocalyptic number.

It is an amenable number.

21255322452 is an abundant number, since it is smaller than the sum of its proper divisors (39785606700).

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

21255322452 is a wasteful number, since it uses less digits than its factorization.

21255322452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19464608 (or 19464606 counting only the distinct ones).

The product of its digits is 48000, while the sum is 33.

Adding to 21255322452 its reverse (25422355212), we get a palindrome (46677677664).

The spelling of 21255322452 in words is "twenty-one billion, two hundred fifty-five million, three hundred twenty-two thousand, four hundred fifty-two".