21772337 has 4 divisors (see below), whose sum is σ = 22017060. Its totient is φ = 21527616.

The previous prime is 21772313. The next prime is 21772339. The reversal of 21772337 is 73327712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2421136 + 19351201 = 1556^2 + 4399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21772337 - 2¹⁰ = 21771313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21772339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122228 + ... + 122405.

It is an arithmetic number, because the mean of its divisors is an integer number (5504265).

Almost surely, 2^21772337 is an apocalyptic number.

It is an amenable number.

21772337 is a deficient number, since it is larger than the sum of its proper divisors (244723).

21772337 is an equidigital number, since it uses as much as digits as its factorization.

21772337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244722.

The product of its digits is 12348, while the sum is 32.

The square root of 21772337 is about 4666.0836897767. The cubic root of 21772337 is about 279.2340332361.

The spelling of 21772337 in words is "twenty-one million, seven hundred seventy-two thousand, three hundred thirty-seven".