21342020009 has 12 divisors (see below), whose sum is σ = 22659344064. Its totient is φ = 20097628632.

The previous prime is 21342019939. The next prime is 21342020023. The reversal of 21342020009 is 90002024312.

It is not a de Polignac number, because 21342020009 - 2⁸ = 21342019753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342020069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116717 + ... + 237290.

It is an arithmetic number, because the mean of its divisors is an integer number (1888278672).

Almost surely, 2^21342020009 is an apocalyptic number.

It is an amenable number.

21342020009 is a deficient number, since it is larger than the sum of its proper divisors (1317324055).

21342020009 is a wasteful number, since it uses less digits than its factorization.

21342020009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354212 (or 354193 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 21342020009 in words is "twenty-one billion, three hundred forty-two million, twenty thousand, nine".