21265622 has 8 divisors (see below), whose sum is σ = 36455376. Its totient is φ = 9113832.

The previous prime is 21265619. The next prime is 21265631. The reversal of 21265622 is 22656212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21265591 and 21265600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759473 + ... + 759500.

It is an arithmetic number, because the mean of its divisors is an integer number (4556922).

Almost surely, 2^21265622 is an apocalyptic number.

21265622 is a deficient number, since it is larger than the sum of its proper divisors (15189754).

21265622 is a wasteful number, since it uses less digits than its factorization.

21265622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518982.

The product of its digits is 2880, while the sum is 26.

The square root of 21265622 is about 4611.4663611480. The cubic root of 21265622 is about 277.0507711460.

The spelling of 21265622 in words is "twenty-one million, two hundred sixty-five thousand, six hundred twenty-two".