211222326645 has 80 divisors (see below), whose sum is σ = 427300600320. Its totient is φ = 98879356800.

The previous prime is 211222326643. The next prime is 211222326649. The reversal of 211222326645 is 546623222112.

211222326645 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 2 + 2 + 3 + 2 + 6 + 645 = 666.

It is not a de Polignac number, because 211222326645 - 2¹ = 211222326643 is a prime.

It is a super-2 number, since 2×211222326645² (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 (211222326643) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 688261 + ... + 946650.

It is an arithmetic number, because the mean of its divisors is an integer number (5341257504).

Almost surely, 2^211222326645 is an apocalyptic number.

It is an amenable number.

211222326645 is an abundant number, since it is smaller than the sum of its proper divisors (216078273675).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211222326645 is a wasteful number, since it uses less digits than its factorization.

211222326645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634968 (or 1634959 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 211222326645 its reverse (546623222112), we get a palindrome (757845548757).

The spelling of 211222326645 in words is "two hundred eleven billion, two hundred twenty-two million, three hundred twenty-six thousand, six hundred forty-five".