213112120221 has 96 divisors (see below), whose sum is σ = 424479514368. Its totient is φ = 99429534720.

The previous prime is 213112120183. The next prime is 213112120267. The reversal of 213112120221 is 122021211312.

213112120221 is a `hidden beast` number, since 213 + 112 + 120 + 221 = 666.

It is not a de Polignac number, because 213112120221 - 2⁶ = 213112120157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213112120194 and 213112120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112120321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13665 + ... + 653001.

It is an arithmetic number, because the mean of its divisors is an integer number (4421661608).

Almost surely, 2^213112120221 is an apocalyptic number.

213112120221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213112120221 is a deficient number, since it is larger than the sum of its proper divisors (211367394147).

213112120221 is a wasteful number, since it uses less digits than its factorization.

213112120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639411 (or 639408 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 213112120221 its reverse (122021211312), we get a palindrome (335133331533).

It can be divided in two parts, 213112 and 120221, that added together give a palindrome (333333).

The spelling of 213112120221 in words is "two hundred thirteen billion, one hundred twelve million, one hundred twenty thousand, two hundred twenty-one".