221001011220220 has 72 divisors (see below), whose sum is σ = 588953344215600. Its totient is φ = 68883432065280.

The previous prime is 221001011220217. The next prime is 221001011220239. The reversal of 221001011220220 is 22022110100122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221001011220194 and 221001011220203.

It is a congruent number.

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, 10250499945 + ... + 10250521504.

It is an arithmetic number, because the mean of its divisors is an integer number (8179907558550).

Almost surely, 2^{221001011220220} is an apocalyptic number.

221001011220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001011220220 is an abundant number, since it is smaller than the sum of its proper divisors (367952332995380).

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

221001011220220 is a wasteful number, since it uses less digits than its factorization.

221001011220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20501021483 (or 20501021474 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221001011220220 its reverse (22022110100122), we get a palindrome (243023121320342).

The spelling of 221001011220220 in words is "two hundred twenty-one trillion, one billion, eleven million, two hundred twenty thousand, two hundred twenty".