21104331 has 8 divisors (see below), whose sum is σ = 28252224. Its totient is φ = 14013000.

The previous prime is 21104329. The next prime is 21104333. The reversal of 21104331 is 13340112.

It is an interprime number because it is at equal distance from previous prime (21104329) and next prime (21104333).

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

It is not a de Polignac number, because 21104331 - 2¹ = 21104329 is a prime.

It is a super-2 number, since 2×21104331² = 890785573915122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21104331.

It is not an unprimeable number, because it can be changed into a prime (21104333) 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, 13261 + ... + 14766.

It is an arithmetic number, because the mean of its divisors is an integer number (3531528).

Almost surely, 2^21104331 is an apocalyptic number.

21104331 is a deficient number, since it is larger than the sum of its proper divisors (7147893).

21104331 is a wasteful number, since it uses less digits than its factorization.

21104331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28281.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21104331 is about 4593.9450366760. The cubic root of 21104331 is about 276.3485540677.

Adding to 21104331 its reverse (13340112), we get a palindrome (34444443).

It can be divided in two parts, 2110 and 4331, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 21104331 in words is "twenty-one million, one hundred four thousand, three hundred thirty-one".