21543274 has 8 divisors (see below), whose sum is σ = 32628960. Its totient is φ = 10666956.

The previous prime is 21543271. The next prime is 21543289. The reversal of 21543274 is 47234512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21543274² = 928225309278152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21543271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52084 + ... + 52495.

It is an arithmetic number, because the mean of its divisors is an integer number (4078620).

Almost surely, 2^21543274 is an apocalyptic number.

21543274 is a deficient number, since it is larger than the sum of its proper divisors (11085686).

21543274 is a wasteful number, since it uses less digits than its factorization.

21543274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104684.

The product of its digits is 6720, while the sum is 28.

The square root of 21543274 is about 4641.4732574906. The cubic root of 21543274 is about 278.2513211305.

Adding to 21543274 its reverse (47234512), we get a palindrome (68777786).

The spelling of 21543274 in words is "twenty-one million, five hundred forty-three thousand, two hundred seventy-four".