21225108651 has 8 divisors (see below), whose sum is σ = 29964859344. Its totient is φ = 13317715200.

The previous prime is 21225108647. The next prime is 21225108659. The reversal of 21225108651 is 15680152212.

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

It is not a de Polignac number, because 21225108651 - 2² = 21225108647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21225108659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208089250 + ... + 208089351.

It is an arithmetic number, because the mean of its divisors is an integer number (3745607418).

Almost surely, 2^21225108651 is an apocalyptic number.

21225108651 is a deficient number, since it is larger than the sum of its proper divisors (8739750693).

21225108651 is a wasteful number, since it uses less digits than its factorization.

21225108651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416178621.

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 21225108651 in words is "twenty-one billion, two hundred twenty-five million, one hundred eight thousand, six hundred fifty-one".