211221001010011 has 4 divisors (see below), whose sum is σ = 211261990924152. Its totient is φ = 211180011095872.

The previous prime is 211221001009999. The next prime is 211221001010053. The reversal of 211221001010011 is 110010100122112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211221001010011 - 2¹⁷ = 211221000878939 is a prime.

It is a super-2 number, since 2×211221001010011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221001009973 and 211221001010000.

It is not an unprimeable number, because it can be changed into a prime (211221001010111) 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, 20494949341 + ... + 20494959646.

It is an arithmetic number, because the mean of its divisors is an integer number (52815497731038).

Almost surely, 2^{211221001010011} is an apocalyptic number.

211221001010011 is a deficient number, since it is larger than the sum of its proper divisors (40989914141).

211221001010011 is an equidigital number, since it uses as much as digits as its factorization.

211221001010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40989914140.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211221001010011 its reverse (110010100122112), we get a palindrome (321231101132123).

The spelling of 211221001010011 in words is "two hundred eleven trillion, two hundred twenty-one billion, one million, ten thousand, eleven".