211221001101 has 32 divisors (see below), whose sum is σ = 320715021312. Its totient is φ = 122398594560.

The previous prime is 211221001099. The next prime is 211221001109. The reversal of 211221001101 is 101100122112.

It is not a de Polignac number, because 211221001101 - 2¹ = 211221001099 is a prime.

It is a super-2 number, since 2×211221001101² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221001109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1914426 + ... + 2021748.

It is an arithmetic number, because the mean of its divisors is an integer number (10022344416).

Almost surely, 2^211221001101 is an apocalyptic number.

It is an amenable number.

211221001101 is a deficient number, since it is larger than the sum of its proper divisors (109494020211).

211221001101 is a wasteful number, since it uses less digits than its factorization.

211221001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109953.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211221001101 its reverse (101100122112), we get a palindrome (312321123213).

The spelling of 211221001101 in words is "two hundred eleven billion, two hundred twenty-one million, one thousand, one hundred one".