21449234 has 4 divisors (see below), whose sum is σ = 32173854. Its totient is φ = 10724616.

The previous prime is 21449231. The next prime is 21449251. The reversal of 21449234 is 43294412.

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

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 3598609 = 4225^2 + 1897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21449197 and 21449206.

It is not an unprimeable number, because it can be changed into a prime (21449231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362307 + ... + 5362310.

Almost surely, 2^21449234 is an apocalyptic number.

21449234 is a deficient number, since it is larger than the sum of its proper divisors (10724620).

21449234 is a wasteful number, since it uses less digits than its factorization.

21449234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10724619.

The product of its digits is 6912, while the sum is 29.

The square root of 21449234 is about 4631.3317739069. The cubic root of 21449234 is about 277.8458593774.

The spelling of 21449234 in words is "twenty-one million, four hundred forty-nine thousand, two hundred thirty-four".