21101404 has 12 divisors (see below), whose sum is σ = 37286704. Its totient is φ = 10448064.

The previous prime is 21101401. The next prime is 21101407. The reversal of 21101404 is 40410112.

It is an interprime number because it is at equal distance from previous prime (21101401) and next prime (21101407).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25197 + ... + 26020.

Almost surely, 2^21101404 is an apocalyptic number.

It is an amenable number.

21101404 is a deficient number, since it is larger than the sum of its proper divisors (16185300).

21101404 is a wasteful number, since it uses less digits than its factorization.

21101404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51324 (or 51322 counting only the distinct ones).

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

The square root of 21101404 is about 4593.6264541210. The cubic root of 21101404 is about 276.3357777073.

Adding to 21101404 its reverse (40410112), we get a palindrome (61511516).

The spelling of 21101404 in words is "twenty-one million, one hundred one thousand, four hundred four".