213123211320 has 64 divisors (see below), whose sum is σ = 640768857120. Its totient is φ = 56708481024.

The previous prime is 213123211309. The next prime is 213123211369. The reversal of 213123211320 is 23112321312.

It is a super-2 number, since 2×213123211320² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1888297 + ... + 1997976.

Almost surely, 2^213123211320 is an apocalyptic number.

213123211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213123211320 is an abundant number, since it is smaller than the sum of its proper divisors (427645645800).

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

213123211320 is a wasteful number, since it uses less digits than its factorization.

213123211320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886744 (or 3886740 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213123211320 its reverse (23112321312), we get a palindrome (236235532632).

The spelling of 213123211320 in words is "two hundred thirteen billion, one hundred twenty-three million, two hundred eleven thousand, three hundred twenty".