21625465 has 8 divisors (see below), whose sum is σ = 26123328. Its totient is φ = 17185200.

The previous prime is 21625463. The next prime is 21625469. The reversal of 21625465 is 56452612.

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

It is not a de Polignac number, because 21625465 - 2¹ = 21625463 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21625463) 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, 13567 + ... + 15076.

It is an arithmetic number, because the mean of its divisors is an integer number (3265416).

Almost surely, 2^21625465 is an apocalyptic number.

It is an amenable number.

21625465 is a deficient number, since it is larger than the sum of its proper divisors (4497863).

21625465 is a wasteful number, since it uses less digits than its factorization.

21625465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28799.

The product of its digits is 14400, while the sum is 31.

The square root of 21625465 is about 4650.3188062755. The cubic root of 21625465 is about 278.6047296841.

The spelling of 21625465 in words is "twenty-one million, six hundred twenty-five thousand, four hundred sixty-five".