21001500607 has 4 divisors (see below), whose sum is σ = 21016260640. Its totient is φ = 20986740576.

The previous prime is 21001500599. The next prime is 21001500631. The reversal of 21001500607 is 70600510012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001500607 - 2³ = 21001500599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001540607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7377882 + ... + 7380727.

It is an arithmetic number, because the mean of its divisors is an integer number (5254065160).

Almost surely, 2^21001500607 is an apocalyptic number.

21001500607 is a deficient number, since it is larger than the sum of its proper divisors (14760033).

21001500607 is a wasteful number, since it uses less digits than its factorization.

21001500607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14760032.

The product of its (nonzero) digits is 420, while the sum is 22.

The spelling of 21001500607 in words is "twenty-one billion, one million, five hundred thousand, six hundred seven".