21534074 has 16 divisors (see below), whose sum is σ = 33303048. Its totient is φ = 10435392.

The previous prime is 21534067. The next prime is 21534083. The reversal of 21534074 is 47043512.

It can be written as a sum of positive squares in 4 ways, for example, as 20313049 + 1221025 = 4507^2 + 1105^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29012 + ... + 29744.

Almost surely, 2^21534074 is an apocalyptic number.

21534074 is a deficient number, since it is larger than the sum of its proper divisors (11768974).

21534074 is a wasteful number, since it uses less digits than its factorization.

21534074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21534074 is about 4640.4820870250. The cubic root of 21534074 is about 278.2117066528.

Adding to 21534074 its reverse (47043512), we get a palindrome (68577586).

The spelling of 21534074 in words is "twenty-one million, five hundred thirty-four thousand, seventy-four".