221000012010 has 96 divisors (see below), whose sum is σ = 596643832512. Its totient is φ = 58857943680.

The previous prime is 221000011987. The next prime is 221000012017. The reversal of 221000012010 is 10210000122.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221000011983 and 221000012001.

It is not an unprimeable number, because it can be changed into a prime (221000012017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1854630 + ... + 1970190.

It is an arithmetic number, because the mean of its divisors is an integer number (6215039922).

Almost surely, 2^221000012010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221000012010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298321916256).

221000012010 is an abundant number, since it is smaller than the sum of its proper divisors (375643820502).

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

221000012010 is a wasteful number, since it uses less digits than its factorization.

221000012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116370 (or 116358 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221000012010 its reverse (10210000122), we get a palindrome (231210012132).

The spelling of 221000012010 in words is "two hundred twenty-one billion, twelve thousand, ten".