26722221 has 16 divisors (see below), whose sum is σ = 37086720. Its totient is φ = 17100720.

The previous prime is 26722211. The next prime is 26722231. The reversal of 26722221 is 12222762.

It is an interprime number because it is at equal distance from previous prime (26722211) and next prime (26722231).

It is not a de Polignac number, because 26722221 - 2¹³ = 26714029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26722191 and 26722200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26722211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5856 + ... + 9366.

It is an arithmetic number, because the mean of its divisors is an integer number (2317920).

Almost surely, 2^26722221 is an apocalyptic number.

It is an amenable number.

26722221 is a deficient number, since it is larger than the sum of its proper divisors (10364499).

26722221 is a wasteful number, since it uses less digits than its factorization.

26722221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616.

The product of its digits is 1344, while the sum is 24.

The square root of 26722221 is about 5169.3540215389. The cubic root of 26722221 is about 298.9676404095.

Adding to 26722221 its reverse (12222762), we get a palindrome (38944983).

The spelling of 26722221 in words is "twenty-six million, seven hundred twenty-two thousand, two hundred twenty-one".