911211421 has 4 divisors (see below), whose sum is σ = 911303712. Its totient is φ = 911119132.

The previous prime is 911211403. The next prime is 911211449. The reversal of 911211421 is 124112119.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 911211421 - 2¹⁷ = 911080349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 911211392 and 911211401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (911211461) 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, 29281 + ... + 51766.

It is an arithmetic number, because the mean of its divisors is an integer number (227825928).

Almost surely, 2^911211421 is an apocalyptic number.

It is an amenable number.

911211421 is a deficient number, since it is larger than the sum of its proper divisors (92291).

911211421 is a wasteful number, since it uses less digits than its factorization.

911211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92290.

The product of its digits is 144, while the sum is 22.

The square root of 911211421 is about 30186.2786875097. The cubic root of 911211421 is about 969.4819286857.

The spelling of 911211421 in words is "nine hundred eleven million, two hundred eleven thousand, four hundred twenty-one".