211221211220011 has 8 divisors (see below), whose sum is σ = 211288923782064. Its totient is φ = 211153505028960.

The previous prime is 211221211219969. The next prime is 211221211220023. The reversal of 211221211220011 is 110022112122112.

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 211221211220011 - 2¹⁹ = 211221210695723 is a prime.

It is a super-2 number, since 2×211221211220011² (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 (211221211220311) 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, 65172996 + ... + 68337118.

It is an arithmetic number, because the mean of its divisors is an integer number (26411115472758).

Almost surely, 2^{211221211220011} is an apocalyptic number.

211221211220011 is a deficient number, since it is larger than the sum of its proper divisors (67712562053).

211221211220011 is a wasteful number, since it uses less digits than its factorization.

211221211220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185501.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221211220011 its reverse (110022112122112), we get a palindrome (321243323342123).

The spelling of 211221211220011 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, eleven".