21401465 has 8 divisors (see below), whose sum is σ = 25766208. Its totient is φ = 17064880.

The previous prime is 21401461. The next prime is 21401473. The reversal of 21401465 is 56410412.

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

It is not a de Polignac number, because 21401465 - 2² = 21401461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21401465.

It is not an unprimeable number, because it can be changed into a prime (21401461) 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, 5327 + ... + 8436.

It is an arithmetic number, because the mean of its divisors is an integer number (3220776).

Almost surely, 2^21401465 is an apocalyptic number.

It is an amenable number.

21401465 is a deficient number, since it is larger than the sum of its proper divisors (4364743).

21401465 is a wasteful number, since it uses less digits than its factorization.

21401465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14079.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21401465 is about 4626.1717434613. The cubic root of 21401465 is about 277.6394451073.

Adding to 21401465 its reverse (56410412), we get a palindrome (77811877).

The spelling of 21401465 in words is "twenty-one million, four hundred one thousand, four hundred sixty-five".