22055621221655 has 32 divisors (see below), whose sum is σ = 30819354107904. Its totient is φ = 14838049339776.

The previous prime is 22055621221651. The next prime is 22055621221729. The reversal of 22055621221655 is 55612212655022.

It is a cyclic number.

It is not a de Polignac number, because 22055621221655 - 2² = 22055621221651 is a prime.

It is a Duffinian number.

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 31 ways as a sum of consecutive naturals, for example, 68041094 + ... + 68364476.

It is an arithmetic number, because the mean of its divisors is an integer number (963104815872).

Almost surely, 2^{22055621221655} is an apocalyptic number.

22055621221655 is a deficient number, since it is larger than the sum of its proper divisors (8763732886249).

22055621221655 is a wasteful number, since it uses less digits than its factorization.

22055621221655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360215.

The product of its (nonzero) digits is 720000, while the sum is 44.

Adding to 22055621221655 its reverse (55612212655022), we get a palindrome (77667833876677).

The spelling of 22055621221655 in words is "twenty-two trillion, fifty-five billion, six hundred twenty-one million, two hundred twenty-one thousand, six hundred fifty-five".