21896461 has 4 divisors (see below), whose sum is σ = 22109152. Its totient is φ = 21683772.

The previous prime is 21896453. The next prime is 21896477. The reversal of 21896461 is 16469812.

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 21896461 - 2³ = 21896453 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 21896461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21896401) 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, 106191 + ... + 106396.

It is an arithmetic number, because the mean of its divisors is an integer number (5527288).

Almost surely, 2^21896461 is an apocalyptic number.

It is an amenable number.

21896461 is a deficient number, since it is larger than the sum of its proper divisors (212691).

21896461 is a wasteful number, since it uses less digits than its factorization.

21896461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212690.

The product of its digits is 20736, while the sum is 37.

The square root of 21896461 is about 4679.3654484342. The cubic root of 21896461 is about 279.7636653733.

The spelling of 21896461 in words is "twenty-one million, eight hundred ninety-six thousand, four hundred sixty-one".