21126007 has 12 divisors (see below), whose sum is σ = 25424280. Its totient is φ = 17482416.

The previous prime is 21125989. The next prime is 21126013. The reversal of 21126007 is 70062112.

It is not a de Polignac number, because 21126007 - 2⁷ = 21125879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126107) 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, 6013 + ... + 8854.

It is an arithmetic number, because the mean of its divisors is an integer number (2118690).

Almost surely, 2^21126007 is an apocalyptic number.

21126007 is a deficient number, since it is larger than the sum of its proper divisors (4298273).

21126007 is a wasteful number, since it uses less digits than its factorization.

21126007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910 (or 14903 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21126007 is about 4596.3036235654. The cubic root of 21126007 is about 276.4431331003.

Adding to 21126007 its reverse (70062112), we get a palindrome (91188119).

The spelling of 21126007 in words is "twenty-one million, one hundred twenty-six thousand, seven".