21434007 has 8 divisors (see below), whose sum is σ = 32661376. Its totient is φ = 12247992.

The previous prime is 21433981. The next prime is 21434027. The reversal of 21434007 is 70043412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21434007 - 2⁸ = 21433751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1020667 = 21434007 / (2 + 1 + 4 + 3 + 4 + 0 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510313 + ... + 510354.

It is an arithmetic number, because the mean of its divisors is an integer number (4082672).

Almost surely, 2^21434007 is an apocalyptic number.

21434007 is a deficient number, since it is larger than the sum of its proper divisors (11227369).

21434007 is a wasteful number, since it uses less digits than its factorization.

21434007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020677.

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

The square root of 21434007 is about 4629.6875704522. The cubic root of 21434007 is about 277.7800954058.

Adding to 21434007 its reverse (70043412), we get a palindrome (91477419).

The spelling of 21434007 in words is "twenty-one million, four hundred thirty-four thousand, seven".