221212112010 has 32 divisors (see below), whose sum is σ = 545257965312. Its totient is φ = 57395574720.

The previous prime is 221212111987. The next prime is 221212112039. The reversal of 221212112010 is 10211212122.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 99643986 + ... + 99646205.

It is an arithmetic number, because the mean of its divisors is an integer number (17039311416).

Almost surely, 2^221212112010 is an apocalyptic number.

221212112010 is an abundant number, since it is smaller than the sum of its proper divisors (324045853302).

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

221212112010 is a wasteful number, since it uses less digits than its factorization.

221212112010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199290238.

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

Adding to 221212112010 its reverse (10211212122), we get a palindrome (231423324132).

The spelling of 221212112010 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, ten".