21272116 has 6 divisors (see below), whose sum is σ = 37226210. Its totient is φ = 10636056.

The previous prime is 21272101. The next prime is 21272123. The reversal of 21272116 is 61127212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19395216 + 1876900 = 4404^2 + 1370^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2659011 + ... + 2659018.

Almost surely, 2^21272116 is an apocalyptic number.

It is an amenable number.

21272116 is a deficient number, since it is larger than the sum of its proper divisors (15954094).

21272116 is a wasteful number, since it uses less digits than its factorization.

21272116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318033 (or 5318031 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 21272116 is about 4612.1704218296. The cubic root of 21272116 is about 277.0789697820.

Adding to 21272116 its reverse (61127212), we get a palindrome (82399328).

The spelling of 21272116 in words is "twenty-one million, two hundred seventy-two thousand, one hundred sixteen".