21140401 has 8 divisors (see below), whose sum is σ = 22425984. Its totient is φ = 19859520.

The previous prime is 21140389. The next prime is 21140423. The reversal of 21140401 is 10404112.

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 21140401 - 2¹¹ = 21138353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13236 + ... + 14746.

It is an arithmetic number, because the mean of its divisors is an integer number (2803248).

Almost surely, 2^21140401 is an apocalyptic number.

It is an amenable number.

21140401 is a deficient number, since it is larger than the sum of its proper divisors (1285583).

21140401 is a wasteful number, since it uses less digits than its factorization.

21140401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21140401 is about 4597.8691803922. The cubic root of 21140401 is about 276.5059027960.

Adding to 21140401 its reverse (10404112), we get a palindrome (31544513).

The spelling of 21140401 in words is "twenty-one million, one hundred forty thousand, four hundred one".