21310034 has 4 divisors (see below), whose sum is σ = 31965054. Its totient is φ = 10655016.

The previous prime is 21310021. The next prime is 21310043. The reversal of 21310034 is 43001312.

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., 18088009 + 3222025 = 4253^2 + 1795^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5327507 + ... + 5327510.

Almost surely, 2^21310034 is an apocalyptic number.

21310034 is a deficient number, since it is larger than the sum of its proper divisors (10655020).

21310034 is a wasteful number, since it uses less digits than its factorization.

21310034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655019.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21310034 is about 4616.2792376545. The cubic root of 21310034 is about 277.2435051138.

Adding to 21310034 its reverse (43001312), we get a palindrome (64311346).

The spelling of 21310034 in words is "twenty-one million, three hundred ten thousand, thirty-four".