221012212012220 has 48 divisors (see below), whose sum is σ = 491889456692928. Its totient is φ = 83126323952640.

The previous prime is 221012212012217. The next prime is 221012212012243. The reversal of 221012212012220 is 22210212210122.

It is a super-2 number, since 2×221012212012220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221012212012192 and 221012212012201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305393951 + ... + 306116790.

It is an arithmetic number, because the mean of its divisors is an integer number (10247697014436).

Almost surely, 2^{221012212012220} is an apocalyptic number.

221012212012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012212012220 is an abundant number, since it is smaller than the sum of its proper divisors (270877244680708).

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

221012212012220 is a wasteful number, since it uses less digits than its factorization.

221012212012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611511830 (or 611511828 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221012212012220 its reverse (22210212210122), we get a palindrome (243222424222342).

The spelling of 221012212012220 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, twelve thousand, two hundred twenty".