21534354 has 24 divisors (see below), whose sum is σ = 46743372. Its totient is φ = 7164960.

The previous prime is 21534349. The next prime is 21534397. The reversal of 21534354 is 45343512.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 328329 = 4605^2 + 573^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17644 + ... + 18824.

Almost surely, 2^21534354 is an apocalyptic number.

21534354 is an abundant number, since it is smaller than the sum of its proper divisors (25209018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21534354 is a wasteful number, since it uses less digits than its factorization.

21534354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202 (or 2199 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 21534354 is about 4640.5122562062. The cubic root of 21534354 is about 278.2129124773.

Adding to 21534354 its reverse (45343512), we get a palindrome (66877866).

The spelling of 21534354 in words is "twenty-one million, five hundred thirty-four thousand, three hundred fifty-four".