211222100211221 has 8 divisors (see below), whose sum is σ = 230424216087744. Its totient is φ = 192020002129120.

The previous prime is 211222100211209. The next prime is 211222100211277. The reversal of 211222100211221 is 122112001222112.

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

It is a de Polignac number, because none of the positive numbers 2^k-211222100211221 is a prime.

It is a super-2 number, since 2×211222100211221² (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 = 211222100211193 and 211222100211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222100211121) 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, 37891721 + ... + 43107153.

It is an arithmetic number, because the mean of its divisors is an integer number (28803027010968).

Almost surely, 2^{211222100211221} is an apocalyptic number.

It is an amenable number.

211222100211221 is a deficient number, since it is larger than the sum of its proper divisors (19202115876523).

211222100211221 is a wasteful number, since it uses less digits than its factorization.

211222100211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8897211.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211222100211221 its reverse (122112001222112), we get a palindrome (333334101433333).

The spelling of 211222100211221 in words is "two hundred eleven trillion, two hundred twenty-two billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".