21400383 has 8 divisors (see below), whose sum is σ = 28555696. Its totient is φ = 14256000.

The previous prime is 21400381. The next prime is 21400387. The reversal of 21400383 is 38300412.

It is a happy number.

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

It is not a de Polignac number, because 21400383 - 2¹ = 21400381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400381) 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, 4833 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (3569462).

Almost surely, 2^21400383 is an apocalyptic number.

21400383 is a deficient number, since it is larger than the sum of its proper divisors (7155313).

21400383 is a wasteful number, since it uses less digits than its factorization.

21400383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21400383 is about 4626.0547986378. The cubic root of 21400383 is about 277.6347661294.

Adding to 21400383 its reverse (38300412), we get a palindrome (59700795).

The spelling of 21400383 in words is "twenty-one million, four hundred thousand, three hundred eighty-three".