211221143031 has 16 divisors (see below), whose sum is σ = 287663459328. Its totient is φ = 137797360800.

The previous prime is 211221142999. The next prime is 211221143033. The reversal of 211221143031 is 130341122112.

It is not a de Polignac number, because 211221143031 - 2⁵ = 211221142999 is a prime.

It is a super-2 number, since 2×211221143031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221142989 and 211221143007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221143033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 859801 + ... + 1077821.

It is an arithmetic number, because the mean of its divisors is an integer number (17978966208).

Almost surely, 2^211221143031 is an apocalyptic number.

211221143031 is a deficient number, since it is larger than the sum of its proper divisors (76442316297).

211221143031 is a wasteful number, since it uses less digits than its factorization.

211221143031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224942.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 211221143031 its reverse (130341122112), we get a palindrome (341562265143).

The spelling of 211221143031 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred forty-three thousand, thirty-one".