21464446 has 4 divisors (see below), whose sum is σ = 32196672. Its totient is φ = 10732222.

The previous prime is 21464423. The next prime is 21464447. The reversal of 21464446 is 64446412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5366110 + ... + 5366113.

It is an arithmetic number, because the mean of its divisors is an integer number (8049168).

Almost surely, 2^21464446 is an apocalyptic number.

21464446 is a deficient number, since it is larger than the sum of its proper divisors (10732226).

21464446 is a wasteful number, since it uses less digits than its factorization.

21464446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10732225.

The product of its digits is 18432, while the sum is 31.

The square root of 21464446 is about 4632.9737750175. The cubic root of 21464446 is about 277.9115274945.

The spelling of 21464446 in words is "twenty-one million, four hundred sixty-four thousand, four hundred forty-six".