210442131421 has 4 divisors (see below), whose sum is σ = 210457978144. Its totient is φ = 210426284700.

The previous prime is 210442131397. The next prime is 210442131437. The reversal of 210442131421 is 124131244012.

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 a cyclic number.

It is not a de Polignac number, because 210442131421 - 2³¹ = 208294647773 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 (210442132421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7903425 + ... + 7930006.

It is an arithmetic number, because the mean of its divisors is an integer number (52614494536).

Almost surely, 2^210442131421 is an apocalyptic number.

It is an amenable number.

210442131421 is a deficient number, since it is larger than the sum of its proper divisors (15846723).

210442131421 is a wasteful number, since it uses less digits than its factorization.

210442131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15846722.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 210442131421 its reverse (124131244012), we get a palindrome (334573375433).

The spelling of 210442131421 in words is "two hundred ten billion, four hundred forty-two million, one hundred thirty-one thousand, four hundred twenty-one".