21446961 has 4 divisors (see below), whose sum is σ = 28595952. Its totient is φ = 14297972.

The previous prime is 21446941. The next prime is 21446963. The reversal of 21446961 is 16964412.

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 21446961 - 2⁶ = 21446897 is a prime.

It is a super-2 number, since 2×21446961² = 919944272271042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21446963) 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, 3574491 + ... + 3574496.

It is an arithmetic number, because the mean of its divisors is an integer number (7148988).

Almost surely, 2^21446961 is an apocalyptic number.

It is an amenable number.

21446961 is a deficient number, since it is larger than the sum of its proper divisors (7148991).

21446961 is an equidigital number, since it uses as much as digits as its factorization.

21446961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7148990.

The product of its digits is 10368, while the sum is 33.

The square root of 21446961 is about 4631.0863736277. The cubic root of 21446961 is about 277.8360444823.

The spelling of 21446961 in words is "twenty-one million, four hundred forty-six thousand, nine hundred sixty-one".