213321321020 has 48 divisors (see below), whose sum is σ = 449940243648. Its totient is φ = 84954977280.

The previous prime is 213321320999. The next prime is 213321321029. The reversal of 213321321020 is 20123123312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 213321320983 and 213321321001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213321321029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4192130 + ... + 4242710.

It is an arithmetic number, because the mean of its divisors is an integer number (9373755076).

Almost surely, 2^213321321020 is an apocalyptic number.

213321321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213321321020 is an abundant number, since it is smaller than the sum of its proper divisors (236618922628).

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

213321321020 is a wasteful number, since it uses less digits than its factorization.

213321321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51510 (or 51508 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213321321020 its reverse (20123123312), we get a palindrome (233444444332).

The spelling of 213321321020 in words is "two hundred thirteen billion, three hundred twenty-one million, three hundred twenty-one thousand, twenty".