21003267007 has 4 divisors (see below), whose sum is σ = 21195957640. Its totient is φ = 20810576376.

The previous prime is 21003267001. The next prime is 21003267017. The reversal of 21003267007 is 70076230012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003267007 is a prime.

It is a super-2 number, since 2×21003267007² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003267001) 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, 96345153 + ... + 96345370.

It is an arithmetic number, because the mean of its divisors is an integer number (5298989410).

Almost surely, 2^21003267007 is an apocalyptic number.

21003267007 is a deficient number, since it is larger than the sum of its proper divisors (192690633).

21003267007 is a wasteful number, since it uses less digits than its factorization.

21003267007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192690632.

The product of its (nonzero) digits is 3528, while the sum is 28.

Adding to 21003267007 its reverse (70076230012), we get a palindrome (91079497019).

The spelling of 21003267007 in words is "twenty-one billion, three million, two hundred sixty-seven thousand, seven".