221011020211212 has 384 divisors, whose sum is σ = 716507430912000. Its totient is φ = 57234551581440.

The previous prime is 221011020211181. The next prime is 221011020211381. The reversal of 221011020211212 is 212112020110122.

221011020211212 is a `hidden beast` number, since 2 + 210 + 1 + 10 + 20 + 211 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8795745793 + ... + 8795770919.

It is an arithmetic number, because the mean of its divisors is an integer number (1865904768000).

Almost surely, 2^{221011020211212} is an apocalyptic number.

221011020211212 is a gapful number since it is divisible by the number (22) 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 221011020211212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358253715456000).

221011020211212 is an abundant number, since it is smaller than the sum of its proper divisors (495496410700788).

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

221011020211212 is a wasteful number, since it uses less digits than its factorization.

221011020211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28266 (or 28258 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221011020211212 its reverse (212112020110122), we get a palindrome (433123040321334).

The spelling of 221011020211212 in words is "two hundred twenty-one trillion, eleven billion, twenty million, two hundred eleven thousand, two hundred twelve".