21116272 has 40 divisors (see below), whose sum is σ = 42117840. Its totient is φ = 10252800.

The previous prime is 21116267. The next prime is 21116273. The reversal of 21116272 is 27261112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117879 + ... + 118057.

It is an arithmetic number, because the mean of its divisors is an integer number (1052946).

Almost surely, 2^21116272 is an apocalyptic number.

It is an amenable number.

21116272 is a deficient number, since it is larger than the sum of its proper divisors (21001568).

21116272 is a wasteful number, since it uses less digits than its factorization.

21116272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 355 counting only the distinct ones).

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

The square root of 21116272 is about 4595.2444983918. The cubic root of 21116272 is about 276.4006643180.

Adding to 21116272 its reverse (27261112), we get a palindrome (48377384).

The spelling of 21116272 in words is "twenty-one million, one hundred sixteen thousand, two hundred seventy-two".