221001101220 has 48 divisors (see below), whose sum is σ = 623254927680. Its totient is φ = 58509641856.

The previous prime is 221001101203. The next prime is 221001101221. The reversal of 221001101220 is 22101100122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 221001101196 and 221001101205.

It is not an unprimeable number, because it can be changed into a prime (221001101221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13241127 + ... + 13257806.

It is an arithmetic number, because the mean of its divisors is an integer number (12984477660).

Almost surely, 2^221001101220 is an apocalyptic number.

221001101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001101220 is an abundant number, since it is smaller than the sum of its proper divisors (402253826460).

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

221001101220 is a wasteful number, since it uses less digits than its factorization.

221001101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26499084 (or 26499082 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221001101220 its reverse (22101100122), we get a palindrome (243102201342).

The spelling of 221001101220 in words is "two hundred twenty-one billion, one million, one hundred one thousand, two hundred twenty".