221021000121012 has 192 divisors, whose sum is σ = 672101355953664. Its totient is φ = 54859294310400.

The previous prime is 221021000120983. The next prime is 221021000121037. The reversal of 221021000121012 is 210121000120122.

It is a junction number, because it is equal to n+sod(n) for n = 221021000120982 and 221021000121000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 341867262 + ... + 342513162.

It is an arithmetic number, because the mean of its divisors is an integer number (3500527895592).

Almost surely, 2^{221021000121012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221021000121012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336050677976832).

221021000121012 is an abundant number, since it is smaller than the sum of its proper divisors (451080355832652).

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

221021000121012 is a wasteful number, since it uses less digits than its factorization.

221021000121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664378 (or 664376 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021000121012 its reverse (210121000120122), we get a palindrome (431142000241134).

The spelling of 221021000121012 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-one thousand, twelve".