21543052 has 6 divisors (see below), whose sum is σ = 37700348. Its totient is φ = 10771524.

The previous prime is 21543031. The next prime is 21543077. The reversal of 21543052 is 25034512.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2692878 + ... + 2692885.

Almost surely, 2^21543052 is an apocalyptic number.

It is an amenable number.

21543052 is a deficient number, since it is larger than the sum of its proper divisors (16157296).

21543052 is a wasteful number, since it uses less digits than its factorization.

21543052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385767 (or 5385765 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21543052 is about 4641.4493426084. The cubic root of 21543052 is about 278.2503653488.

Adding to 21543052 its reverse (25034512), we get a palindrome (46577564).

The spelling of 21543052 in words is "twenty-one million, five hundred forty-three thousand, fifty-two".