211221211020212 has 48 divisors (see below), whose sum is σ = 396298428966720. Its totient is φ = 98154407232000.

The previous prime is 211221211020139. The next prime is 211221211020217. The reversal of 211221211020212 is 212020112122112.

It is a super-2 number, since 2×211221211020212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221211020217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37970114 + ... + 43176057.

It is an arithmetic number, because the mean of its divisors is an integer number (8256217270140).

Almost surely, 2^{211221211020212} is an apocalyptic number.

It is an amenable number.

211221211020212 is a deficient number, since it is larger than the sum of its proper divisors (185077217946508).

211221211020212 is a wasteful number, since it uses less digits than its factorization.

211221211020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81146672 (or 81146670 counting only the distinct ones).

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

Adding to 211221211020212 its reverse (212020112122112), we get a palindrome (423241323142324).

The spelling of 211221211020212 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, twenty thousand, two hundred twelve".