21192273 has 12 divisors (see below), whose sum is σ = 31745168. Its totient is φ = 14128020.

The previous prime is 21192271. The next prime is 21192287. The reversal of 21192273 is 37229112.

It is not a de Polignac number, because 21192273 - 2¹ = 21192271 is a prime.

It is a super-2 number, since 2×21192273² = 898224869813058, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21192271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43363 + ... + 43848.

Almost surely, 2^21192273 is an apocalyptic number.

It is an amenable number.

21192273 is a deficient number, since it is larger than the sum of its proper divisors (10552895).

21192273 is an frugal number, since it uses more digits than its factorization.

21192273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87226 (or 87214 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 21192273 is about 4603.5065982357. The cubic root of 21192273 is about 276.7318713751.

The spelling of 21192273 in words is "twenty-one million, one hundred ninety-two thousand, two hundred seventy-three".