221201012220 has 24 divisors (see below), whose sum is σ = 619362834384. Its totient is φ = 58986936576.

The previous prime is 221201012209. The next prime is 221201012231. The reversal of 221201012220 is 22210102122.

It is an interprime number because it is at equal distance from previous prime (221201012209) and next prime (221201012231).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221201012220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1843341709 + ... + 1843341828.

It is an arithmetic number, because the mean of its divisors is an integer number (25806784766).

Almost surely, 2^221201012220 is an apocalyptic number.

221201012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201012220 is an abundant number, since it is smaller than the sum of its proper divisors (398161822164).

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

221201012220 is a wasteful number, since it uses less digits than its factorization.

221201012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686683549 (or 3686683547 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221201012220 its reverse (22210102122), we get a palindrome (243411114342).

The spelling of 221201012220 in words is "two hundred twenty-one billion, two hundred one million, twelve thousand, two hundred twenty".