21453034 has 4 divisors (see below), whose sum is σ = 32179554. Its totient is φ = 10726516.

The previous prime is 21453017. The next prime is 21453037. The reversal of 21453034 is 43035412.

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., 21206025 + 247009 = 4605^2 + 497^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21452996 and 21453014.

It is not an unprimeable number, because it can be changed into a prime (21453037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363257 + ... + 5363260.

Almost surely, 2^21453034 is an apocalyptic number.

21453034 is a deficient number, since it is larger than the sum of its proper divisors (10726520).

21453034 is a wasteful number, since it uses less digits than its factorization.

21453034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726519.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21453034 is about 4631.7420049049. The cubic root of 21453034 is about 277.8622663646.

Adding to 21453034 its reverse (43035412), we get a palindrome (64488446).

The spelling of 21453034 in words is "twenty-one million, four hundred fifty-three thousand, thirty-four".