221001100100010 has 80 divisors (see below), whose sum is σ = 600924339793800. Its totient is φ = 58271451093504.

The previous prime is 221001100100009. The next prime is 221001100100051. The reversal of 221001100100010 is 10001001100122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 196697511462321 + 24303588637689 = 14024889^2 + 4929867^2 .

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 = 221001100099965 and 221001100100001.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1532741755 + ... + 1532885934.

Almost surely, 2^{221001100100010} is an apocalyptic number.

221001100100010 is an abundant number, since it is smaller than the sum of its proper divisors (379923239693790).

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

221001100100010 is a wasteful number, since it uses less digits than its factorization.

221001100100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065627797 (or 3065627788 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 221001100100010 its reverse (10001001100122), we get a palindrome (231002101200132).

The spelling of 221001100100010 in words is "two hundred twenty-one trillion, one billion, one hundred million, one hundred thousand, ten".