21225368252 has 12 divisors (see below), whose sum is σ = 40521157656. Its totient is φ = 9647894640.

The previous prime is 21225368239. The next prime is 21225368273. The reversal of 21225368252 is 25286352212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241197323 + ... + 241197410.

It is an arithmetic number, because the mean of its divisors is an integer number (3376763138).

Almost surely, 2^21225368252 is an apocalyptic number.

21225368252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21225368252 is a deficient number, since it is larger than the sum of its proper divisors (19295789404).

21225368252 is a wasteful number, since it uses less digits than its factorization.

21225368252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482394748 (or 482394746 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 21225368252 in words is "twenty-one billion, two hundred twenty-five million, three hundred sixty-eight thousand, two hundred fifty-two".