11347821 has 24 divisors (see below), whose sum is σ = 16947840. Its totient is φ = 7312896.

The previous prime is 11347813. The next prime is 11347837. The reversal of 11347821 is 12874311.

It is not a de Polignac number, because 11347821 - 2³ = 11347813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11347811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58701 + ... + 58893.

It is an arithmetic number, because the mean of its divisors is an integer number (706160).

Almost surely, 2^11347821 is an apocalyptic number.

It is an amenable number.

11347821 is a deficient number, since it is larger than the sum of its proper divisors (5600019).

11347821 is a wasteful number, since it uses less digits than its factorization.

11347821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 382 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 11347821 is about 3368.6526980382. The cubic root of 11347821 is about 224.7178091925.

The spelling of 11347821 in words is "eleven million, three hundred forty-seven thousand, eight hundred twenty-one".