21740274 has 24 divisors (see below), whose sum is σ = 47190780. Its totient is φ = 7233408.

The previous prime is 21740249. The next prime is 21740281. The reversal of 21740274 is 47204712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21483225 + 257049 = 4635^2 + 507^2 .

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, 16222 + ... + 17510.

Almost surely, 2^21740274 is an apocalyptic number.

21740274 is an abundant number, since it is smaller than the sum of its proper divisors (25450506).

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

21740274 is a wasteful number, since it uses less digits than its factorization.

21740274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234 (or 2231 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 21740274 is about 4662.6466732962. The cubic root of 21740274 is about 279.0968946992.

Adding to 21740274 its reverse (47204712), we get a palindrome (68944986).

The spelling of 21740274 in words is "twenty-one million, seven hundred forty thousand, two hundred seventy-four".