21772274 has 16 divisors (see below), whose sum is σ = 34688088. Its totient is φ = 10213632.

The previous prime is 21772259. The next prime is 21772313. The reversal of 21772274 is 47227712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21576025 + 196249 = 4645^2 + 443^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21772274.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12692 + ... + 14304.

Almost surely, 2^21772274 is an apocalyptic number.

21772274 is a deficient number, since it is larger than the sum of its proper divisors (12915814).

21772274 is a wasteful number, since it uses less digits than its factorization.

21772274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029.

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

The square root of 21772274 is about 4666.0769389285. The cubic root of 21772274 is about 279.2337639071.

Adding to 21772274 its reverse (47227712), we get a palindrome (68999986).

The spelling of 21772274 in words is "twenty-one million, seven hundred seventy-two thousand, two hundred seventy-four".