11561421 has 8 divisors (see below), whose sum is σ = 15496704. Its totient is φ = 7666880.

The previous prime is 11561371. The next prime is 11561423. The reversal of 11561421 is 12416511.

11561421 is digitally balanced in base 2, base 3 and base 4, 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 a cyclic number.

It is not a de Polignac number, because 11561421 - 2¹⁵ = 11528653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561423) 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, 9516 + ... + 10661.

It is an arithmetic number, because the mean of its divisors is an integer number (1937088).

Almost surely, 2^11561421 is an apocalyptic number.

It is an amenable number.

11561421 is a deficient number, since it is larger than the sum of its proper divisors (3935283).

11561421 is a wasteful number, since it uses less digits than its factorization.

11561421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371.

The product of its digits is 240, while the sum is 21.

The square root of 11561421 is about 3400.2089641668. The cubic root of 11561421 is about 226.1190082480.

Adding to 11561421 its reverse (12416511), we get a palindrome (23977932).

The spelling of 11561421 in words is "eleven million, five hundred sixty-one thousand, four hundred twenty-one".