213400431421 has 4 divisors (see below), whose sum is σ = 222678711072. Its totient is φ = 204122151772.

The previous prime is 213400431383. The next prime is 213400431427. The reversal of 213400431421 is 124134004312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 213400431421 - 2²³ = 213392042813 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 (213400431427) 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, 4639139791 + ... + 4639139836.

It is an arithmetic number, because the mean of its divisors is an integer number (55669677768).

Almost surely, 2^213400431421 is an apocalyptic number.

It is an amenable number.

213400431421 is a deficient number, since it is larger than the sum of its proper divisors (9278279651).

213400431421 is an equidigital number, since it uses as much as digits as its factorization.

213400431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9278279650.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 213400431421 its reverse (124134004312), we get a palindrome (337534435733).

The spelling of 213400431421 in words is "two hundred thirteen billion, four hundred million, four hundred thirty-one thousand, four hundred twenty-one".