21435104 has 12 divisors (see below), whose sum is σ = 42200424. Its totient is φ = 10717536.

The previous prime is 21435101. The next prime is 21435107. The reversal of 21435104 is 40153412.

It is an interprime number because it is at equal distance from previous prime (21435101) and next prime (21435107).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334892 + ... + 334955.

It is an arithmetic number, because the mean of its divisors is an integer number (3516702).

Almost surely, 2^21435104 is an apocalyptic number.

It is an amenable number.

21435104 is a deficient number, since it is larger than the sum of its proper divisors (20765320).

21435104 is an equidigital number, since it uses as much as digits as its factorization.

21435104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669857 (or 669849 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21435104 is about 4629.8060434537. The cubic root of 21435104 is about 277.7848342859.

Adding to 21435104 its reverse (40153412), we get a palindrome (61588516).

The spelling of 21435104 in words is "twenty-one million, four hundred thirty-five thousand, one hundred four".