203401211421 has 4 divisors (see below), whose sum is σ = 271201615232. Its totient is φ = 135600807612.

The previous prime is 203401211411. The next prime is 203401211449. The reversal of 203401211421 is 124112104302.

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 203401211421 - 2⁶ = 203401211357 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 (203401211411) 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, 33900201901 + ... + 33900201906.

It is an arithmetic number, because the mean of its divisors is an integer number (67800403808).

Almost surely, 2^203401211421 is an apocalyptic number.

It is an amenable number.

203401211421 is a deficient number, since it is larger than the sum of its proper divisors (67800403811).

203401211421 is an equidigital number, since it uses as much as digits as its factorization.

203401211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67800403810.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 203401211421 its reverse (124112104302), we get a palindrome (327513315723).

The spelling of 203401211421 in words is "two hundred three billion, four hundred one million, two hundred eleven thousand, four hundred twenty-one".