213144405420 has 96 divisors (see below), whose sum is σ = 599750807040. Its totient is φ = 56558269440.

The previous prime is 213144405389. The next prime is 213144405427. The reversal of 213144405420 is 24504441312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (213144405427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21092089 + ... + 21102191.

It is an arithmetic number, because the mean of its divisors is an integer number (6247404240).

Almost surely, 2^213144405420 is an apocalyptic number.

213144405420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213144405420 is an abundant number, since it is smaller than the sum of its proper divisors (386606401620).

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

213144405420 is a wasteful number, since it uses less digits than its factorization.

213144405420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11815 (or 11813 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 213144405420 its reverse (24504441312), we get a palindrome (237648846732).

The spelling of 213144405420 in words is "two hundred thirteen billion, one hundred forty-four million, four hundred five thousand, four hundred twenty".