26222721 has 16 divisors (see below), whose sum is σ = 42309504. Its totient is φ = 14102784.

The previous prime is 26222719. The next prime is 26222743. The reversal of 26222721 is 12722262.

It is not a de Polignac number, because 26222721 - 2¹ = 26222719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26222691 and 26222700.

It is not an unprimeable number, because it can be changed into a prime (26222701) 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, 36370 + ... + 37083.

It is an arithmetic number, because the mean of its divisors is an integer number (2644344).

Almost surely, 2^26222721 is an apocalyptic number.

26222721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26222721 is a deficient number, since it is larger than the sum of its proper divisors (16086783).

26222721 is a wasteful number, since it uses less digits than its factorization.

26222721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73480.

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

The square root of 26222721 is about 5120.8125331826. The cubic root of 26222721 is about 297.0931132279.

Adding to 26222721 its reverse (12722262), we get a palindrome (38944983).

The spelling of 26222721 in words is "twenty-six million, two hundred twenty-two thousand, seven hundred twenty-one".