21452270 has 32 divisors (see below), whose sum is σ = 45163008. Its totient is φ = 7183008.

The previous prime is 21452269. The next prime is 21452309. The reversal of 21452270 is 7225412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (1411344).

Almost surely, 2^21452270 is an apocalyptic number.

21452270 is an abundant number, since it is smaller than the sum of its proper divisors (23710738).

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

21452270 is a wasteful number, since it uses less digits than its factorization.

21452270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21452270 is about 4631.6595298014. The cubic root of 21452270 is about 277.8589678523.

Adding to 21452270 its reverse (7225412), we get a palindrome (28677682).

The spelling of 21452270 in words is "twenty-one million, four hundred fifty-two thousand, two hundred seventy".