213422440420 has 96 divisors (see below), whose sum is σ = 534677262336. Its totient is φ = 69966652800.

The previous prime is 213422440393. The next prime is 213422440421. The reversal of 213422440420 is 24044224312.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (213422440421) 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, 10264635 + ... + 10285405.

It is an arithmetic number, because the mean of its divisors is an integer number (5569554816).

Almost surely, 2^213422440420 is an apocalyptic number.

213422440420 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 213422440420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267338631168).

213422440420 is an abundant number, since it is smaller than the sum of its proper divisors (321254821916).

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

213422440420 is a wasteful number, since it uses less digits than its factorization.

213422440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24001 (or 23999 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 213422440420 its reverse (24044224312), we get a palindrome (237466664732).

The spelling of 213422440420 in words is "two hundred thirteen billion, four hundred twenty-two million, four hundred forty thousand, four hundred twenty".