213422332421 has 4 divisors (see below), whose sum is σ = 216921059244. Its totient is φ = 209923605600.

The previous prime is 213422332411. The next prime is 213422332507. The reversal of 213422332421 is 124233224312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 122947708321 + 90474624100 = 350639^2 + 300790^2 .

It is a cyclic number.

It is not a de Polignac number, because 213422332421 - 2²² = 213418138117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213422332411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749363320 + ... + 1749363441.

It is an arithmetic number, because the mean of its divisors is an integer number (54230264811).

Almost surely, 2^213422332421 is an apocalyptic number.

It is an amenable number.

213422332421 is a deficient number, since it is larger than the sum of its proper divisors (3498726823).

213422332421 is an equidigital number, since it uses as much as digits as its factorization.

213422332421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498726822.

The product of its digits is 13824, while the sum is 29.

Adding to 213422332421 its reverse (124233224312), we get a palindrome (337655556733).

The spelling of 213422332421 in words is "two hundred thirteen billion, four hundred twenty-two million, three hundred thirty-two thousand, four hundred twenty-one".