21142255309 has 8 divisors (see below), whose sum is σ = 25583905728. Its totient is φ = 17055936960.

The previous prime is 21142255307. The next prime is 21142255327. The reversal of 21142255309 is 90355224112.

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 21142255309 - 2¹ = 21142255307 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 (21142255307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88832887 + ... + 88833124.

It is an arithmetic number, because the mean of its divisors is an integer number (3197988216).

Almost surely, 2^21142255309 is an apocalyptic number.

It is an amenable number.

21142255309 is a deficient number, since it is larger than the sum of its proper divisors (4441650419).

21142255309 is a wasteful number, since it uses less digits than its factorization.

21142255309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177666035.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 21142255309 in words is "twenty-one billion, one hundred forty-two million, two hundred fifty-five thousand, three hundred nine".