21254421452 has 24 divisors (see below), whose sum is σ = 40886379072. Its totient is φ = 9587349200.

The previous prime is 21254421449. The next prime is 21254421481. The reversal of 21254421452 is 25412445212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1837958 + ... + 1849485.

It is an arithmetic number, because the mean of its divisors is an integer number (1703599128).

Almost surely, 2^21254421452 is an apocalyptic number.

21254421452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21254421452 is a deficient number, since it is larger than the sum of its proper divisors (19631957620).

21254421452 is a wasteful number, since it uses less digits than its factorization.

21254421452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687589 (or 3687587 counting only the distinct ones).

The product of its digits is 25600, while the sum is 32.

Adding to 21254421452 its reverse (25412445212), we get a palindrome (46666866664).

The spelling of 21254421452 in words is "twenty-one billion, two hundred fifty-four million, four hundred twenty-one thousand, four hundred fifty-two".