211221211012 has 48 divisors (see below), whose sum is σ = 436738563072. Its totient is φ = 87468877440.

The previous prime is 211221210947. The next prime is 211221211021. The reversal of 211221211012 is 210112122112.

211221211012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211221211012² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380478 + ... + 753130.

It is an arithmetic number, because the mean of its divisors is an integer number (9098720064).

Almost surely, 2^211221211012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211221211012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218369281536).

211221211012 is an abundant number, since it is smaller than the sum of its proper divisors (225517352060).

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

211221211012 is a wasteful number, since it uses less digits than its factorization.

211221211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373348 (or 373346 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211221211012 its reverse (210112122112), we get a palindrome (421333333124).

The spelling of 211221211012 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, twelve".