21272774 has 8 divisors (see below), whose sum is σ = 32432448. Its totient is φ = 10461960.

The previous prime is 21272759. The next prime is 21272803. The reversal of 21272774 is 47727212.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21272774.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87062 + ... + 87305.

It is an arithmetic number, because the mean of its divisors is an integer number (4054056).

Almost surely, 2^21272774 is an apocalyptic number.

21272774 is a deficient number, since it is larger than the sum of its proper divisors (11159674).

21272774 is a wasteful number, since it uses less digits than its factorization.

21272774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174430.

The product of its digits is 10976, while the sum is 32.

The square root of 21272774 is about 4612.2417542883. The cubic root of 21272774 is about 277.0818266688.

Adding to 21272774 its reverse (47727212), we get a palindrome (68999986).

The spelling of 21272774 in words is "twenty-one million, two hundred seventy-two thousand, seven hundred seventy-four".