21003421040239 has 4 divisors (see below), whose sum is σ = 22912822953000. Its totient is φ = 19094019127480.

The previous prime is 21003421040227. The next prime is 21003421040279. The reversal of 21003421040239 is 93204012430012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21003421040239 - 2⁷ = 21003421040111 is a prime.

It is a super-2 number, since 2×21003421040239² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003421040239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003421040279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954700956364 + ... + 954700956385.

It is an arithmetic number, because the mean of its divisors is an integer number (5728205738250).

Almost surely, 2^{21003421040239} is an apocalyptic number.

21003421040239 is a deficient number, since it is larger than the sum of its proper divisors (1909401912761).

21003421040239 is a wasteful number, since it uses less digits than its factorization.

21003421040239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909401912760.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21003421040239 in words is "twenty-one trillion, three billion, four hundred twenty-one million, forty thousand, two hundred thirty-nine".