21225512255 has 8 divisors (see below), whose sum is σ = 25902320400. Its totient is φ = 16692606016.

The previous prime is 21225512251. The next prime is 21225512263. The reversal of 21225512255 is 55221552212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21225512255 - 2² = 21225512251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225512251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35975150 + ... + 35975739.

It is an arithmetic number, because the mean of its divisors is an integer number (3237790050).

Almost surely, 2^21225512255 is an apocalyptic number.

21225512255 is a deficient number, since it is larger than the sum of its proper divisors (4676808145).

21225512255 is an equidigital number, since it uses as much as digits as its factorization.

21225512255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71950953.

The product of its digits is 20000, while the sum is 32.

The spelling of 21225512255 in words is "twenty-one billion, two hundred twenty-five million, five hundred twelve thousand, two hundred fifty-five".