221020220212212 has 24 divisors (see below), whose sum is σ = 515740003510816. Its totient is φ = 73669670116128.

The previous prime is 221020220212171. The next prime is 221020220212223. The reversal of 221020220212212 is 212212022020122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466831198 + ... + 467304405.

Almost surely, 2^{221020220212212} is an apocalyptic number.

It is an amenable number.

221020220212212 is an abundant number, since it is smaller than the sum of its proper divisors (294719783298604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221020220212212 is a wasteful number, since it uses less digits than its factorization.

221020220212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934155327 (or 934155325 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221020220212212 its reverse (212212022020122), we get a palindrome (433232242232334).

The spelling of 221020220212212 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, two hundred twelve thousand, two hundred twelve".