221211000201210 has 128 divisors (see below), whose sum is σ = 545905842306048. Its totient is φ = 57333878784000.

The previous prime is 221211000201203. The next prime is 221211000201211. The reversal of 221211000201210 is 12102000112122.

It is a super-2 number, since 2×221211000201210² (a number of 29 digits) contains 22 as substring.

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 221211000201210.

It is not an unprimeable number, because it can be changed into a prime (221211000201211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6720249672 + ... + 6720282588.

It is an arithmetic number, because the mean of its divisors is an integer number (4264889393016).

Almost surely, 2^{221211000201210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211000201210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272952921153024).

221211000201210 is an abundant number, since it is smaller than the sum of its proper divisors (324694842104838).

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

221211000201210 is a wasteful number, since it uses less digits than its factorization.

221211000201210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53400.

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

Adding to 221211000201210 its reverse (12102000112122), we get a palindrome (233313000313332).

The spelling of 221211000201210 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred one thousand, two hundred ten".