221212110006 has 24 divisors (see below), whose sum is σ = 479635556400. Its totient is φ = 73684654416.

The previous prime is 221212109999. The next prime is 221212110043. The reversal of 221212110006 is 600011212122.

It is a super-2 number, since 2×221212110006² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4367085 + ... + 4417448.

It is an arithmetic number, because the mean of its divisors is an integer number (19984814850).

Almost surely, 2^221212110006 is an apocalyptic number.

221212110006 is an abundant number, since it is smaller than the sum of its proper divisors (258423446394).

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

221212110006 is a wasteful number, since it uses less digits than its factorization.

221212110006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8785940 (or 8785937 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221212110006 its reverse (600011212122), we get a palindrome (821223322128).

The spelling of 221212110006 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, six".