221001210021212 has 12 divisors (see below), whose sum is σ = 386806520754360. Its totient is φ = 110485061234256.

The previous prime is 221001210021187. The next prime is 221001210021253. The reversal of 221001210021212 is 212120012100122.

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, 3885912098 + ... + 3885968969.

It is an arithmetic number, because the mean of its divisors is an integer number (32233876729530).

Almost surely, 2^{221001210021212} is an apocalyptic number.

It is an amenable number.

221001210021212 is a deficient number, since it is larger than the sum of its proper divisors (165805310733148).

221001210021212 is a wasteful number, since it uses less digits than its factorization.

221001210021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771888180 (or 7771888178 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221001210021212 its reverse (212120012100122), we get a palindrome (433121222121334).

The spelling of 221001210021212 in words is "two hundred twenty-one trillion, one billion, two hundred ten million, twenty-one thousand, two hundred twelve".