211221102012 has 24 divisors (see below), whose sum is σ = 492883246800. Its totient is φ = 70402175616.

The previous prime is 211221102007. The next prime is 211221102017. The reversal of 211221102012 is 210201122112.

It is an interprime number because it is at equal distance from previous prime (211221102007) and next prime (211221102017).

It is a super-2 number, since 2×211221102012² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221101982 and 211221102000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221102017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423937 + ... + 775992.

It is an arithmetic number, because the mean of its divisors is an integer number (20536801950).

Almost surely, 2^211221102012 is an apocalyptic number.

It is an amenable number.

211221102012 is an abundant number, since it is smaller than the sum of its proper divisors (281662144788).

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

211221102012 is a wasteful number, since it uses less digits than its factorization.

211221102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214605 (or 1214603 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221102012 its reverse (210201122112), we get a palindrome (421422224124).

The spelling of 211221102012 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred two thousand, twelve".