21127370 has 64 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 7176960.

The previous prime is 21127367. The next prime is 21127387. The reversal of 21127370 is 7372112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117941 + ... + 118119.

It is an arithmetic number, because the mean of its divisors is an integer number (692550).

Almost surely, 2^21127370 is an apocalyptic number.

21127370 is an abundant number, since it is smaller than the sum of its proper divisors (23195830).

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

21127370 is a wasteful number, since it uses less digits than its factorization.

21127370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21127370 is about 4596.4518924927. The cubic root of 21127370 is about 276.4490781248.

Adding to 21127370 its reverse (7372112), we get a palindrome (28499482).

The spelling of 21127370 in words is "twenty-one million, one hundred twenty-seven thousand, three hundred seventy".