21434012 has 6 divisors (see below), whose sum is σ = 37509528. Its totient is φ = 10717004.

The previous prime is 21433981. The next prime is 21434027. The reversal of 21434012 is 21043412.

It is a super-2 number, since 2×21434012² = 918833740832288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679248 + ... + 2679255.

It is an arithmetic number, because the mean of its divisors is an integer number (6251588).

Almost surely, 2^21434012 is an apocalyptic number.

It is an amenable number.

21434012 is a deficient number, since it is larger than the sum of its proper divisors (16075516).

21434012 is a wasteful number, since it uses less digits than its factorization.

21434012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358507 (or 5358505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21434012 is about 4629.6881104455. The cubic root of 21434012 is about 277.7801170055.

Adding to 21434012 its reverse (21043412), we get a palindrome (42477424).

The spelling of 21434012 in words is "twenty-one million, four hundred thirty-four thousand, twelve".