22021263656 has 96 divisors (see below), whose sum is σ = 49434184800. Its totient is φ = 9163082880.

The previous prime is 22021263647. The next prime is 22021263683. The reversal of 22021263656 is 65636212022.

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, 8280455 + ... + 8283113.

It is an arithmetic number, because the mean of its divisors is an integer number (514939425).

Almost surely, 2^22021263656 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 22021263656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24717092400).

22021263656 is an abundant number, since it is smaller than the sum of its proper divisors (27412921144).

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

22021263656 is a wasteful number, since it uses less digits than its factorization.

22021263656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3276 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 22021263656 its reverse (65636212022), we get a palindrome (87657475678).

The spelling of 22021263656 in words is "twenty-two billion, twenty-one million, two hundred sixty-three thousand, six hundred fifty-six".