211221230131 has 8 divisors (see below), whose sum is σ = 235416851280. Its totient is φ = 188333480448.

The previous prime is 211221230117. The next prime is 211221230141. The reversal of 211221230131 is 131032122112.

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 211221230131 - 2²¹ = 211219132979 is a prime.

It is a super-2 number, since 2×211221230131² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221230099 and 211221230108.

It is not an unprimeable number, because it can be changed into a prime (211221230111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326967526 + ... + 326968171.

It is an arithmetic number, because the mean of its divisors is an integer number (29427106410).

Almost surely, 2^211221230131 is an apocalyptic number.

211221230131 is a deficient number, since it is larger than the sum of its proper divisors (24195621149).

211221230131 is a wasteful number, since it uses less digits than its factorization.

211221230131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653935733.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211221230131 its reverse (131032122112), we get a palindrome (342253352243).

The spelling of 211221230131 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred thirty thousand, one hundred thirty-one".