21325104 has 30 divisors (see below), whose sum is σ = 59681076. Its totient is φ = 7108320.

The previous prime is 21325099. The next prime is 21325147. The reversal of 21325104 is 40152312.

Added to its reverse (40152312) it gives a triangular number (61477416 = T₁₁₀₈₈).

It is a super-2 number, since 2×21325104² = 909520121221632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73902 + ... + 74189.

Almost surely, 2^21325104 is an apocalyptic number.

21325104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21325104 is an abundant number, since it is smaller than the sum of its proper divisors (38355972).

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

21325104 is a wasteful number, since it uses less digits than its factorization.

21325104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148105 (or 148096 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21325104 is about 4617.9112161236. The cubic root of 21325104 is about 277.3088432722.

Adding to 21325104 its reverse (40152312), we get a palindrome (61477416).

The spelling of 21325104 in words is "twenty-one million, three hundred twenty-five thousand, one hundred four".