211288813421 has 4 divisors (see below), whose sum is σ = 241472929632. Its totient is φ = 181104697212.

The previous prime is 211288813403. The next prime is 211288813457. The reversal of 211288813421 is 124318882112.

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 211288813421 - 2²⁶ = 211221704557 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 (211288813471) 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, 15092058095 + ... + 15092058108.

It is an arithmetic number, because the mean of its divisors is an integer number (60368232408).

Almost surely, 2^211288813421 is an apocalyptic number.

It is an amenable number.

211288813421 is a deficient number, since it is larger than the sum of its proper divisors (30184116211).

211288813421 is an equidigital number, since it uses as much as digits as its factorization.

211288813421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30184116210.

The product of its digits is 49152, while the sum is 41.

The spelling of 211288813421 in words is "two hundred eleven billion, two hundred eighty-eight million, eight hundred thirteen thousand, four hundred twenty-one".