21011730007 has 4 divisors (see below), whose sum is σ = 21063103840. Its totient is φ = 20960356176.

The previous prime is 21011729987. The next prime is 21011730029. The reversal of 21011730007 is 70003711012.

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-21011730007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011730007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011730097) 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, 25686303 + ... + 25687120.

It is an arithmetic number, because the mean of its divisors is an integer number (5265775960).

Almost surely, 2^21011730007 is an apocalyptic number.

21011730007 is a deficient number, since it is larger than the sum of its proper divisors (51373833).

21011730007 is an equidigital number, since it uses as much as digits as its factorization.

21011730007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51373832.

The product of its (nonzero) digits is 294, while the sum is 22.

The spelling of 21011730007 in words is "twenty-one billion, eleven million, seven hundred thirty thousand, seven".