21301011509 has 8 divisors (see below), whose sum is σ = 22581836928. Its totient is φ = 20023277760.

The previous prime is 21301011497. The next prime is 21301011527. The reversal of 21301011509 is 90511010312.

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

It is a cyclic number.

It is not a de Polignac number, because 21301011509 - 2³² = 17006044213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301013509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758717 + ... + 786290.

It is an arithmetic number, because the mean of its divisors is an integer number (2822729616).

Almost surely, 2^21301011509 is an apocalyptic number.

It is an amenable number.

21301011509 is a deficient number, since it is larger than the sum of its proper divisors (1280825419).

21301011509 is a wasteful number, since it uses less digits than its factorization.

21301011509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545835.

The product of its (nonzero) digits is 270, while the sum is 23.

The spelling of 21301011509 in words is "twenty-one billion, three hundred one million, eleven thousand, five hundred nine".