21463617 has 12 divisors (see below), whose sum is σ = 33290736. Its totient is φ = 12264840.

The previous prime is 21463613. The next prime is 21463621. The reversal of 21463617 is 71636412.

It is an interprime number because it is at equal distance from previous prime (21463613) and next prime (21463621).

It is not a de Polignac number, because 21463617 - 2² = 21463613 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21463613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72859 + ... + 73152.

It is an arithmetic number, because the mean of its divisors is an integer number (2774228).

Almost surely, 2^21463617 is an apocalyptic number.

It is an amenable number.

21463617 is a deficient number, since it is larger than the sum of its proper divisors (11827119).

21463617 is a wasteful number, since it uses less digits than its factorization.

21463617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146028 (or 146021 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 21463617 is about 4632.8843067791. The cubic root of 21463617 is about 277.9079496147.

The spelling of 21463617 in words is "twenty-one million, four hundred sixty-three thousand, six hundred seventeen".