21683461 has 4 divisors (see below), whose sum is σ = 21742912. Its totient is φ = 21624012.

The previous prime is 21683437. The next prime is 21683491. The reversal of 21683461 is 16438612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21683461 - 2⁵ = 21683429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29175 + ... + 29908.

It is an arithmetic number, because the mean of its divisors is an integer number (5435728).

Almost surely, 2^21683461 is an apocalyptic number.

It is an amenable number.

21683461 is a deficient number, since it is larger than the sum of its proper divisors (59451).

21683461 is an equidigital number, since it uses as much as digits as its factorization.

21683461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59450.

The product of its digits is 6912, while the sum is 31.

The square root of 21683461 is about 4656.5503325960. The cubic root of 21683461 is about 278.8535649815.

The spelling of 21683461 in words is "twenty-one million, six hundred eighty-three thousand, four hundred sixty-one".