211221202012 has 12 divisors (see below), whose sum is σ = 371223530496. Its totient is φ = 105157336160.

The previous prime is 211221201949. The next prime is 211221202019. The reversal of 211221202012 is 210202122112.

It is a happy number.

It is a super-2 number, since 2×211221202012² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221202019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113315164 + ... + 113317027.

It is an arithmetic number, because the mean of its divisors is an integer number (30935294208).

Almost surely, 2^211221202012 is an apocalyptic number.

It is an amenable number.

211221202012 is a deficient number, since it is larger than the sum of its proper divisors (160002328484).

211221202012 is a wasteful number, since it uses less digits than its factorization.

211221202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226632428 (or 226632426 counting only the distinct ones).

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

Adding to 211221202012 its reverse (210202122112), we get a palindrome (421423324124).

The spelling of 211221202012 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred two thousand, twelve".