221220100010 has 32 divisors (see below), whose sum is σ = 490087608192. Its totient is φ = 70012514880.

The previous prime is 221220100009. The next prime is 221220100043. The reversal of 221220100010 is 10001022122.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221220099964 and 221220100000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121548596 + ... + 121550415.

It is an arithmetic number, because the mean of its divisors is an integer number (15315237756).

Almost surely, 2^221220100010 is an apocalyptic number.

221220100010 is an abundant number, since it is smaller than the sum of its proper divisors (268867508182).

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

221220100010 is a wasteful number, since it uses less digits than its factorization.

221220100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243099038.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221220100010 its reverse (10001022122), we get a palindrome (231221122132).

The spelling of 221220100010 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred thousand, ten".