21734004 has 12 divisors (see below), whose sum is σ = 50712704. Its totient is φ = 7244664.

The previous prime is 21734003. The next prime is 21734017. The reversal of 21734004 is 40043712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21734003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905572 + ... + 905595.

Almost surely, 2^21734004 is an apocalyptic number.

It is an amenable number.

21734004 is an abundant number, since it is smaller than the sum of its proper divisors (28978700).

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

21734004 is a wasteful number, since it uses less digits than its factorization.

21734004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811174 (or 1811172 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21734004 is about 4661.9742599032. The cubic root of 21734004 is about 279.0700611554.

Adding to 21734004 its reverse (40043712), we get a palindrome (61777716).

The spelling of 21734004 in words is "twenty-one million, seven hundred thirty-four thousand, four".