21349404 has 36 divisors (see below), whose sum is σ = 54110784. Its totient is φ = 7097472.

The previous prime is 21349403. The next prime is 21349453. The reversal of 21349404 is 40494312.

21349404 is a `hidden beast` number, since 213 + 49 + 404 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21364 + ... + 22340.

Almost surely, 2^21349404 is an apocalyptic number.

It is an amenable number.

21349404 is an abundant number, since it is smaller than the sum of its proper divisors (32761380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21349404 is a wasteful number, since it uses less digits than its factorization.

21349404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21349404 is about 4620.5415267044. The cubic root of 21349404 is about 277.4141346221.

The spelling of 21349404 in words is "twenty-one million, three hundred forty-nine thousand, four hundred four".