21532754 has 4 divisors (see below), whose sum is σ = 32299134. Its totient is φ = 10766376.

The previous prime is 21532747. The next prime is 21532781. The reversal of 21532754 is 45723512.

It is a happy number.

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., 21390625 + 142129 = 4625^2 + 377^2 .

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, 5383187 + ... + 5383190.

Almost surely, 2^21532754 is an apocalyptic number.

21532754 is a deficient number, since it is larger than the sum of its proper divisors (10766380).

21532754 is a wasteful number, since it uses less digits than its factorization.

21532754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10766379.

The product of its digits is 8400, while the sum is 29.

The square root of 21532754 is about 4640.3398582431. The cubic root of 21532754 is about 278.2060219110.

The spelling of 21532754 in words is "twenty-one million, five hundred thirty-two thousand, seven hundred fifty-four".