13423204213021 has 8 divisors (see below), whose sum is σ = 13473393043320. Its totient is φ = 13373017519872.

The previous prime is 13423204213009. The next prime is 13423204213129. The reversal of 13423204213021 is 12031240232431.

It can be written as a sum of positive squares in 4 ways, for example, as 280911660121 + 13142292552900 = 530011^2 + 3625230^2 .

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 13423204213021 - 2¹⁹ = 13423203688733 is a prime.

It is a super-2 number, since 2×13423204213021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13423204213621) 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, 12658681 + ... + 13678033.

It is an arithmetic number, because the mean of its divisors is an integer number (1684174130415).

Almost surely, 2^{13423204213021} is an apocalyptic number.

It is an amenable number.

13423204213021 is a deficient number, since it is larger than the sum of its proper divisors (50188830299).

13423204213021 is a wasteful number, since it uses less digits than its factorization.

13423204213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068575.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 13423204213021 its reverse (12031240232431), we get a palindrome (25454444445452).

The spelling of 13423204213021 in words is "thirteen trillion, four hundred twenty-three billion, two hundred four million, two hundred thirteen thousand, twenty-one".