213112312020 has 144 divisors (see below), whose sum is σ = 656360070912. Its totient is φ = 55960450560.

The previous prime is 213112312003. The next prime is 213112312081. The reversal of 213112312020 is 20213211312.

213112312020 is a `hidden beast` number, since 21 + 311 + 2 + 312 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213112311984 and 213112312002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8278489 + ... + 8304191.

It is an arithmetic number, because the mean of its divisors is an integer number (4558056048).

Almost surely, 2^213112312020 is an apocalyptic number.

213112312020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213112312020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328180035456).

213112312020 is an abundant number, since it is smaller than the sum of its proper divisors (443247758892).

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

213112312020 is a wasteful number, since it uses less digits than its factorization.

213112312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26422 (or 26417 counting only the distinct ones).

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

Adding to 213112312020 its reverse (20213211312), we get a palindrome (233325523332).

The spelling of 213112312020 in words is "two hundred thirteen billion, one hundred twelve million, three hundred twelve thousand, twenty".