220521030655 has 8 divisors (see below), whose sum is σ = 264647473200. Its totient is φ = 176402000256.

The previous prime is 220521030647. The next prime is 220521030707. The reversal of 220521030655 is 556030125022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220521030655 - 2³ = 220521030647 is a prime.

It is a super-2 number, since 2×220521030655² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787370 + ... + 1906759.

It is an arithmetic number, because the mean of its divisors is an integer number (33080934150).

Almost surely, 2^220521030655 is an apocalyptic number.

220521030655 is a deficient number, since it is larger than the sum of its proper divisors (44126442545).

220521030655 is a wasteful number, since it uses less digits than its factorization.

220521030655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706073.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 220521030655 its reverse (556030125022), we get a palindrome (776551155677).

The spelling of 220521030655 in words is "two hundred twenty billion, five hundred twenty-one million, thirty thousand, six hundred fifty-five".