13442400021 has 16 divisors (see below), whose sum is σ = 18979907904. Its totient is φ = 8433379584.

The previous prime is 13442400011. The next prime is 13442400043. The reversal of 13442400021 is 12000424431.

It is not a de Polignac number, because 13442400021 - 2⁵ = 13442399989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13442400011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645250 + ... + 665756.

It is an arithmetic number, because the mean of its divisors is an integer number (1186244244).

Almost surely, 2^13442400021 is an apocalyptic number.

It is an amenable number.

13442400021 is a deficient number, since it is larger than the sum of its proper divisors (5537507883).

13442400021 is a wasteful number, since it uses less digits than its factorization.

13442400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33380.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 13442400021 its reverse (12000424431), we get a palindrome (25442824452).

The spelling of 13442400021 in words is "thirteen billion, four hundred forty-two million, four hundred thousand, twenty-one".