211221212211011 has 8 divisors (see below), whose sum is σ = 223678016733024. Its totient is φ = 198767966281600.

The previous prime is 211221212211007. The next prime is 211221212211059. The reversal of 211221212211011 is 110112212122112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211221212211011 - 2² = 211221212211007 is a prime.

It is a super-2 number, since 2×211221212211011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221212211211) 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, 889525940 + ... + 889763361.

It is an arithmetic number, because the mean of its divisors is an integer number (27959752091628).

Almost surely, 2^{211221212211011} is an apocalyptic number.

211221212211011 is a deficient number, since it is larger than the sum of its proper divisors (12456804522013).

211221212211011 is a wasteful number, since it uses less digits than its factorization.

211221212211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779296301.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211221212211011 its reverse (110112212122112), we get a palindrome (321333424333123).

The spelling of 211221212211011 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred eleven thousand, eleven".