211421042321 has 4 divisors (see below), whose sum is σ = 211584808944. Its totient is φ = 211257275700.

The previous prime is 211421042299. The next prime is 211421042369. The reversal of 211421042321 is 123240124112.

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 211421042321 - 2²² = 211416848017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211421042381) 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, 81881375 + ... + 81883956.

It is an arithmetic number, because the mean of its divisors is an integer number (52896202236).

Almost surely, 2^211421042321 is an apocalyptic number.

It is an amenable number.

211421042321 is a deficient number, since it is larger than the sum of its proper divisors (163766623).

211421042321 is a wasteful number, since it uses less digits than its factorization.

211421042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163766622.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 211421042321 its reverse (123240124112), we get a palindrome (334661166433).

The spelling of 211421042321 in words is "two hundred eleven billion, four hundred twenty-one million, forty-two thousand, three hundred twenty-one".