21306499801 has 8 divisors (see below), whose sum is σ = 21810104064. Its totient is φ = 20804990400.

The previous prime is 21306499793. The next prime is 21306499817. The reversal of 21306499801 is 10899460312.

It is a happy number.

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 21306499801 - 2³ = 21306499793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21306499861) 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, 503125 + ... + 543826.

It is an arithmetic number, because the mean of its divisors is an integer number (2726263008).

Almost surely, 2^21306499801 is an apocalyptic number.

It is an amenable number.

21306499801 is a deficient number, since it is larger than the sum of its proper divisors (503604263).

21306499801 is a wasteful number, since it uses less digits than its factorization.

21306499801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047431.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21306499801 in words is "twenty-one billion, three hundred six million, four hundred ninety-nine thousand, eight hundred one".