221001021212 has 12 divisors (see below), whose sum is σ = 386757381696. Its totient is φ = 110498912160.

The previous prime is 221001021211. The next prime is 221001021233. The reversal of 221001021212 is 212120100122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001021211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55628 + ... + 667155.

It is an arithmetic number, because the mean of its divisors is an integer number (32229781808).

Almost surely, 2^221001021212 is an apocalyptic number.

It is an amenable number.

221001021212 is a deficient number, since it is larger than the sum of its proper divisors (165756360484).

221001021212 is a wasteful number, since it uses less digits than its factorization.

221001021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799228 (or 799226 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221001021212 its reverse (212120100122), we get a palindrome (433121121334).

The spelling of 221001021212 in words is "two hundred twenty-one billion, one million, twenty-one thousand, two hundred twelve".