21835004 has 36 divisors (see below), whose sum is σ = 42364224. Its totient is φ = 9812352.

The previous prime is 21834997. The next prime is 21835007. The reversal of 21835004 is 40053812.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835007) 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, 35669 + ... + 36275.

It is an arithmetic number, because the mean of its divisors is an integer number (1176784).

Almost surely, 2^21835004 is an apocalyptic number.

It is an amenable number.

21835004 is a deficient number, since it is larger than the sum of its proper divisors (20529220).

21835004 is a wasteful number, since it uses less digits than its factorization.

21835004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21835004 is about 4672.7940249919. The cubic root of 21835004 is about 279.5016816921.

Adding to 21835004 its reverse (40053812), we get a palindrome (61888816).

The spelling of 21835004 in words is "twenty-one million, eight hundred thirty-five thousand, four".