22055621221656 has 288 divisors, whose sum is σ = 67772993848560. Its totient is φ = 6470720256000.

The previous prime is 22055621221651. The next prime is 22055621221729. The reversal of 22055621221656 is 65612212655022.

22055621221656 is a `hidden beast` number, since 2 + 2 + 0 + 5 + 5 + 621 + 2 + 2 + 16 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22055621221651) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 46556476 + ... + 47027828.

Almost surely, 2^{22055621221656} 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 22055621221656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33886496924280).

22055621221656 is an abundant number, since it is smaller than the sum of its proper divisors (45717372626904).

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

22055621221656 is a wasteful number, since it uses less digits than its factorization.

22055621221656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471559 (or 471541 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

Adding to 22055621221656 its reverse (65612212655022), we get a palindrome (87667833876678).

The spelling of 22055621221656 in words is "twenty-two trillion, fifty-five billion, six hundred twenty-one million, two hundred twenty-one thousand, six hundred fifty-six".