21573034 has 48 divisors (see below), whose sum is σ = 41663808. Its totient is φ = 8308608.

The previous prime is 21573031. The next prime is 21573049. The reversal of 21573034 is 43037512.

It is not an unprimeable number, because it can be changed into a prime (21573031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38037 + ... + 38599.

It is an arithmetic number, because the mean of its divisors is an integer number (867996).

Almost surely, 2^21573034 is an apocalyptic number.

21573034 is a deficient number, since it is larger than the sum of its proper divisors (20090774).

21573034 is a wasteful number, since it uses less digits than its factorization.

21573034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 21573034 is about 4644.6780297454. The cubic root of 21573034 is about 278.3793881584.

The spelling of 21573034 in words is "twenty-one million, five hundred seventy-three thousand, thirty-four".