221212021012 has 12 divisors (see below), whose sum is σ = 407495828320. Its totient is φ = 104784641496.

The previous prime is 221212020979. The next prime is 221212021033. The reversal of 221212021012 is 210120212122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1455342168 + ... + 1455342319.

Almost surely, 2^221212021012 is an apocalyptic number.

It is an amenable number.

221212021012 is a deficient number, since it is larger than the sum of its proper divisors (186283807308).

221212021012 is a wasteful number, since it uses less digits than its factorization.

221212021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910684510 (or 2910684508 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221212021012 its reverse (210120212122), we get a palindrome (431332233134).

The spelling of 221212021012 in words is "two hundred twenty-one billion, two hundred twelve million, twenty-one thousand, twelve".