21424100240409 has 8 divisors (see below), whose sum is σ = 28565493876480. Its totient is φ = 14282720048976.

The previous prime is 21424100240359. The next prime is 21424100240441. The reversal of 21424100240409 is 90404200142412.

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

It is not a de Polignac number, because 21424100240409 - 2¹⁵ = 21424100207641 is a prime.

It is a super-2 number, since 2×21424100240409² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21424100240409.

It is not an unprimeable number, because it can be changed into a prime (21424100240449) 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, 1267687 + ... + 6667475.

It is an arithmetic number, because the mean of its divisors is an integer number (3570686734560).

Almost surely, 2^{21424100240409} is an apocalyptic number.

It is an amenable number.

21424100240409 is a deficient number, since it is larger than the sum of its proper divisors (7141393636071).

21424100240409 is a wasteful number, since it uses less digits than its factorization.

21424100240409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722319.

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 21424100240409 in words is "twenty-one trillion, four hundred twenty-four billion, one hundred million, two hundred forty thousand, four hundred nine".