21421404362426 has 16 divisors (see below), whose sum is σ = 33530661630144. Its totient is φ = 10244559012864.

The previous prime is 21421404362353. The next prime is 21421404362429. The reversal of 21421404362426 is 62426340412412.

It is not an unprimeable number, because it can be changed into a prime (21421404362429) 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, 9429416 + ... + 11478531.

It is an arithmetic number, because the mean of its divisors is an integer number (2095666351884).

Almost surely, 2^{21421404362426} is an apocalyptic number.

21421404362426 is a deficient number, since it is larger than the sum of its proper divisors (12109257267718).

21421404362426 is a wasteful number, since it uses less digits than its factorization.

21421404362426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20930245.

The product of its (nonzero) digits is 442368, while the sum is 41.

Adding to 21421404362426 its reverse (62426340412412), we get a palindrome (83847744774838).

The spelling of 21421404362426 in words is "twenty-one trillion, four hundred twenty-one billion, four hundred four million, three hundred sixty-two thousand, four hundred twenty-six".