211231003221 has 48 divisors (see below), whose sum is σ = 358591833600. Its totient is φ = 117287460864.

The previous prime is 211231003211. The next prime is 211231003223. The reversal of 211231003221 is 122300132112.

211231003221 is a `hidden beast` number, since 21 + 12 + 310 + 0 + 322 + 1 = 666.

It is not a de Polignac number, because 211231003221 - 2⁵ = 211231003189 is a prime.

It is a super-2 number, since 2×211231003221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211231003194 and 211231003203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231003223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1733620 + ... + 1851458.

It is an arithmetic number, because the mean of its divisors is an integer number (7470663200).

Almost surely, 2^211231003221 is an apocalyptic number.

211231003221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211231003221 is a deficient number, since it is larger than the sum of its proper divisors (147360830379).

211231003221 is a wasteful number, since it uses less digits than its factorization.

211231003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118658 (or 118655 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211231003221 its reverse (122300132112), we get a palindrome (333531135333).

The spelling of 211231003221 in words is "two hundred eleven billion, two hundred thirty-one million, three thousand, two hundred twenty-one".