211221010012 has 12 divisors (see below), whose sum is σ = 369641318256. Its totient is φ = 105609204800.

The previous prime is 211221010003. The next prime is 211221010109. The reversal of 211221010012 is 210010122112.

It is a super-2 number, since 2×211221010012² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221009974 and 211221010001.

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, 103137 + ... + 658087.

It is an arithmetic number, because the mean of its divisors is an integer number (30803443188).

Almost surely, 2^211221010012 is an apocalyptic number.

It is an amenable number.

211221010012 is a deficient number, since it is larger than the sum of its proper divisors (158420308244).

211221010012 is a wasteful number, since it uses less digits than its factorization.

211221010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650108 (or 650106 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211221010012 its reverse (210010122112), we get a palindrome (421231132124).

The spelling of 211221010012 in words is "two hundred eleven billion, two hundred twenty-one million, ten thousand, twelve".