221212030412 has 24 divisors (see below), whose sum is σ = 391323431520. Its totient is φ = 109406568960.

The previous prime is 221212030399. The next prime is 221212030483. The reversal of 221212030412 is 214030212122.

It is a super-2 number, since 2×221212030412² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568889 + ... + 875247.

It is an arithmetic number, because the mean of its divisors is an integer number (16305142980).

Almost surely, 2^221212030412 is an apocalyptic number.

It is an amenable number.

221212030412 is a deficient number, since it is larger than the sum of its proper divisors (170111401108).

221212030412 is a wasteful number, since it uses less digits than its factorization.

221212030412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308321 (or 308319 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221212030412 its reverse (214030212122), we get a palindrome (435242242534).

The spelling of 221212030412 in words is "two hundred twenty-one billion, two hundred twelve million, thirty thousand, four hundred twelve".