21486965 has 8 divisors (see below), whose sum is σ = 25827768. Its totient is φ = 17160640.

The previous prime is 21486953. The next prime is 21486977. The reversal of 21486965 is 56968412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21486953) and next prime (21486977).

It can be written as a sum of positive squares in 4 ways, for example, as 40804 + 21446161 = 202^2 + 4631^2 .

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

It is not a de Polignac number, because 21486965 - 2⁶ = 21486901 is a prime.

It is a super-2 number, since 2×21486965² = 923379329822450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26 + ... + 6555.

It is an arithmetic number, because the mean of its divisors is an integer number (3228471).

Almost surely, 2^21486965 is an apocalyptic number.

It is an amenable number.

21486965 is a deficient number, since it is larger than the sum of its proper divisors (4340803).

21486965 is an equidigital number, since it uses as much as digits as its factorization.

21486965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239.

The product of its digits is 103680, while the sum is 41.

The square root of 21486965 is about 4635.4034344380. The cubic root of 21486965 is about 278.0086819917.

The spelling of 21486965 in words is "twenty-one million, four hundred eighty-six thousand, nine hundred sixty-five".