221000211201212 has 24 divisors (see below), whose sum is σ = 391020425841360. Its totient is φ = 109281739322880.

The previous prime is 221000211201179. The next prime is 221000211201221. The reversal of 221000211201212 is 212102112000122.

It is a congruent number.

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, 205687262 + ... + 206758917.

It is an arithmetic number, because the mean of its divisors is an integer number (16292517743390).

Almost surely, 2^{221000211201212} is an apocalyptic number.

It is an amenable number.

221000211201212 is a deficient number, since it is larger than the sum of its proper divisors (170020214640148).

221000211201212 is a wasteful number, since it uses less digits than its factorization.

221000211201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412447661 (or 412447659 counting only the distinct ones).

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

Adding to 221000211201212 its reverse (212102112000122), we get a palindrome (433102323201334).

The spelling of 221000211201212 in words is "two hundred twenty-one trillion, two hundred eleven million, two hundred one thousand, two hundred twelve".