221220553260 has 192 divisors, whose sum is σ = 733156945920. Its totient is φ = 48765050880.

The previous prime is 221220553217. The next prime is 221220553283. The reversal of 221220553260 is 62355022122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11086012 + ... + 11105948.

It is an arithmetic number, because the mean of its divisors is an integer number (3818525760).

Almost surely, 2^221220553260 is an apocalyptic number.

221220553260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221220553260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366578472960).

221220553260 is an abundant number, since it is smaller than the sum of its proper divisors (511936392660).

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

221220553260 is a wasteful number, since it uses less digits than its factorization.

221220553260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20896 (or 20894 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 221220553260 its reverse (62355022122), we get a palindrome (283575575382).

The spelling of 221220553260 in words is "two hundred twenty-one billion, two hundred twenty million, five hundred fifty-three thousand, two hundred sixty".