21082424109 has 8 divisors (see below), whose sum is σ = 28116232032. Its totient is φ = 14051782800.

The previous prime is 21082424101. The next prime is 21082424123. The reversal of 21082424109 is 90142428012.

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

It is not a de Polignac number, because 21082424109 - 2³ = 21082424101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21082424109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082424101) 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, 776074 + ... + 802779.

It is an arithmetic number, because the mean of its divisors is an integer number (3514529004).

Almost surely, 2^21082424109 is an apocalyptic number.

It is an amenable number.

21082424109 is a deficient number, since it is larger than the sum of its proper divisors (7033807923).

21082424109 is a wasteful number, since it uses less digits than its factorization.

21082424109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583307.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 21082424109 in words is "twenty-one billion, eighty-two million, four hundred twenty-four thousand, one hundred nine".