11371821 has 8 divisors (see below), whose sum is σ = 15821760. Its totient is φ = 7251552.

The previous prime is 11371817. The next prime is 11371831. The reversal of 11371821 is 12817311.

It is a happy number.

11371821 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11371821 - 2² = 11371817 is a prime.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11371791 and 11371800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11371831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82336 + ... + 82473.

It is an arithmetic number, because the mean of its divisors is an integer number (1977720).

Almost surely, 2^11371821 is an apocalyptic number.

It is an amenable number.

11371821 is a deficient number, since it is larger than the sum of its proper divisors (4449939).

11371821 is a wasteful number, since it uses less digits than its factorization.

11371821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164835.

The product of its digits is 336, while the sum is 24.

The square root of 11371821 is about 3372.2130715600. The cubic root of 11371821 is about 224.8761194607.

The spelling of 11371821 in words is "eleven million, three hundred seventy-one thousand, eight hundred twenty-one".