21407995 has 8 divisors (see below), whose sum is σ = 29359584. Its totient is φ = 14679744.

The previous prime is 21407989. The next prime is 21407999. The reversal of 21407995 is 59970412.

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 21407995 - 2¹³ = 21399803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21407999) 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, 305794 + ... + 305863.

It is an arithmetic number, because the mean of its divisors is an integer number (3669948).

Almost surely, 2^21407995 is an apocalyptic number.

21407995 is a deficient number, since it is larger than the sum of its proper divisors (7951589).

21407995 is an equidigital number, since it uses as much as digits as its factorization.

21407995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611669.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 21407995 is about 4626.8774567736. The cubic root of 21407995 is about 277.6676799534.

The spelling of 21407995 in words is "twenty-one million, four hundred seven thousand, nine hundred ninety-five".