21377104 has 80 divisors (see below), whose sum is σ = 50282496. Its totient is φ = 8611200.

The previous prime is 21377093. The next prime is 21377119. The reversal of 21377104 is 40177312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163119 + ... + 163249.

Almost surely, 2^21377104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25141248).

21377104 is an abundant number, since it is smaller than the sum of its proper divisors (28905392).

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

21377104 is a wasteful number, since it uses less digits than its factorization.

21377104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21377104 is about 4623.5380392076. The cubic root of 21377104 is about 277.5340606949.

The spelling of 21377104 in words is "twenty-one million, three hundred seventy-seven thousand, one hundred four".