221021121201212 has 12 divisors (see below), whose sum is σ = 390335466342360. Its totient is φ = 109496702246256.

The previous prime is 221021121201193. The next prime is 221021121201263. The reversal of 221021121201212 is 212102121120122.

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, 253464588098 + ... + 253464588969.

It is an arithmetic number, because the mean of its divisors is an integer number (32527955528530).

Almost surely, 2^{221021121201212} is an apocalyptic number.

It is an amenable number.

221021121201212 is a deficient number, since it is larger than the sum of its proper divisors (169314345141148).

221021121201212 is a wasteful number, since it uses less digits than its factorization.

221021121201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506929177180 (or 506929177178 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221021121201212 its reverse (212102121120122), we get a palindrome (433123242321334).

The spelling of 221021121201212 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty-one million, two hundred one thousand, two hundred twelve".