11171421 has 6 divisors (see below), whose sum is σ = 16136510. Its totient is φ = 7447608.

The previous prime is 11171401. The next prime is 11171429. The reversal of 11171421 is 12417111.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 22500 = 3339^2 + 150^2 .

It is not a de Polignac number, because 11171421 - 2⁵ = 11171389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11171394 and 11171403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11171429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 620626 + ... + 620643.

Almost surely, 2^11171421 is an apocalyptic number.

It is an amenable number.

11171421 is a deficient number, since it is larger than the sum of its proper divisors (4965089).

11171421 is a wasteful number, since it uses less digits than its factorization.

11171421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241275 (or 1241272 counting only the distinct ones).

The product of its digits is 56, while the sum is 18.

The square root of 11171421 is about 3342.3675740409. The cubic root of 11171421 is about 223.5473226822.

Adding to 11171421 its reverse (12417111), we get a palindrome (23588532).

The spelling of 11171421 in words is "eleven million, one hundred seventy-one thousand, four hundred twenty-one".