211210330122421 has 4 divisors (see below), whose sum is σ = 241383234425632. Its totient is φ = 181037425819212.

The previous prime is 211210330122377. The next prime is 211210330122509. The reversal of 211210330122421 is 124221033012112.

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 211210330122421 - 2¹⁵ = 211210330089653 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 (211210330152421) 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, 15086452151595 + ... + 15086452151608.

It is an arithmetic number, because the mean of its divisors is an integer number (60345808606408).

Almost surely, 2^{211210330122421} is an apocalyptic number.

It is an amenable number.

211210330122421 is a deficient number, since it is larger than the sum of its proper divisors (30172904303211).

211210330122421 is an equidigital number, since it uses as much as digits as its factorization.

211210330122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30172904303210.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 211210330122421 its reverse (124221033012112), we get a palindrome (335431363134533).

The spelling of 211210330122421 in words is "two hundred eleven trillion, two hundred ten billion, three hundred thirty million, one hundred twenty-two thousand, four hundred twenty-one".