211221111210101 has 8 divisors (see below), whose sum is σ = 223646029516224. Its totient is φ = 198796209243840.

The previous prime is 211221111210059. The next prime is 211221111210103. The reversal of 211221111210101 is 101012111122112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221111210101 is a prime.

It is a super-2 number, since 2×211221111210101² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 211221111210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221111210103) 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, 31273286 + ... + 37422728.

It is an arithmetic number, because the mean of its divisors is an integer number (27955753689528).

Almost surely, 2^{211221111210101} is an apocalyptic number.

It is an amenable number.

211221111210101 is a deficient number, since it is larger than the sum of its proper divisors (12424918306123).

211221111210101 is a wasteful number, since it uses less digits than its factorization.

211221111210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8169931.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211221111210101 its reverse (101012111122112), we get a palindrome (312233222332213).

The spelling of 211221111210101 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred eleven million, two hundred ten thousand, one hundred one".