21227373 has 32 divisors (see below), whose sum is σ = 33696000. Its totient is φ = 13160448.

The previous prime is 21227363. The next prime is 21227377. The reversal of 21227373 is 37372212.

It is a happy number.

It is not a de Polignac number, because 21227373 - 2⁴ = 21227357 is a prime.

It is a super-2 number, since 2×21227373² = 901202728962258, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47053 + ... + 47501.

It is an arithmetic number, because the mean of its divisors is an integer number (1053000).

Almost surely, 2^21227373 is an apocalyptic number.

It is an amenable number.

21227373 is a deficient number, since it is larger than the sum of its proper divisors (12468627).

21227373 is a wasteful number, since it uses less digits than its factorization.

21227373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 572 counting only the distinct ones).

The product of its digits is 3528, while the sum is 27.

The square root of 21227373 is about 4607.3173322444. The cubic root of 21227373 is about 276.8845674549.

Adding to 21227373 its reverse (37372212), we get a palindrome (58599585).

The spelling of 21227373 in words is "twenty-one million, two hundred twenty-seven thousand, three hundred seventy-three".