22001256 has 96 divisors (see below), whose sum is σ = 63390600. Its totient is φ = 6881280.

The previous prime is 22001237. The next prime is 22001261. The reversal of 22001256 is 65210022.

It can be written as a sum of positive squares in 4 ways, for example, as 19660356 + 2340900 = 4434^2 + 1530^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85480 + ... + 85736.

Almost surely, 2^22001256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22001256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31695300).

22001256 is an abundant number, since it is smaller than the sum of its proper divisors (41389344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22001256 is a wasteful number, since it uses less digits than its factorization.

22001256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22001256 is about 4690.5496479624. The cubic root of 22001256 is about 280.2092653298.

Adding to 22001256 its reverse (65210022), we get a palindrome (87211278).

The spelling of 22001256 in words is "twenty-two million, one thousand, two hundred fifty-six".