213121230020340 has 96 divisors (see below), whose sum is σ = 601492230549504. Its totient is φ = 56379762109440.

The previous prime is 213121230020329. The next prime is 213121230020381. The reversal of 213121230020340 is 43020032121312.

It is a self number, because there is not a number n which added to its sum of digits gives 213121230020340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83917570 + ... + 86419910.

It is an arithmetic number, because the mean of its divisors is an integer number (6265544068224).

Almost surely, 2^{213121230020340} is an apocalyptic number.

213121230020340 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 213121230020340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300746115274752).

213121230020340 is an abundant number, since it is smaller than the sum of its proper divisors (388371000529164).

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

213121230020340 is a wasteful number, since it uses less digits than its factorization.

213121230020340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513657 (or 2513655 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 213121230020340 its reverse (43020032121312), we get a palindrome (256141262141652).

The spelling of 213121230020340 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred thirty million, twenty thousand, three hundred forty".