221020211212 has 24 divisors (see below), whose sum is σ = 387426727296. Its totient is φ = 110326975488.

The previous prime is 221020211207. The next prime is 221020211231. The reversal of 221020211212 is 212112020122.

It is a happy 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, 8763973 + ... + 8789155.

It is an arithmetic number, because the mean of its divisors is an integer number (16142780304).

Almost surely, 2^221020211212 is an apocalyptic number.

It is an amenable number.

221020211212 is a deficient number, since it is larger than the sum of its proper divisors (166406516084).

221020211212 is a wasteful number, since it uses less digits than its factorization.

221020211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28737 (or 28735 counting only the distinct ones).

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

Adding to 221020211212 its reverse (212112020122), we get a palindrome (433132231334).

The spelling of 221020211212 in words is "two hundred twenty-one billion, twenty million, two hundred eleven thousand, two hundred twelve".