21213554606439 has 16 divisors (see below), whose sum is σ = 30466658779872. Its totient is φ = 13051850807808.

The previous prime is 21213554606407. The next prime is 21213554606459. The reversal of 21213554606439 is 93460645531212.

It is a happy number.

It is not a de Polignac number, because 21213554606439 - 2⁵ = 21213554606407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21213554606391 and 21213554606400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213554606459) 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, 54895294 + ... + 55280379.

It is an arithmetic number, because the mean of its divisors is an integer number (1904166173742).

Almost surely, 2^{21213554606439} is an apocalyptic number.

21213554606439 is a deficient number, since it is larger than the sum of its proper divisors (9253104173433).

21213554606439 is a wasteful number, since it uses less digits than its factorization.

21213554606439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110180626.

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 21213554606439 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, six hundred six thousand, four hundred thirty-nine".