21213554536242 has 16 divisors (see below), whose sum is σ = 47141232302880. Its totient is φ = 7071184845396.

The previous prime is 21213554536201. The next prime is 21213554536249. The reversal of 21213554536242 is 24263545531212.

21213554536242 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 5 + 545 + 3 + 62 + 42 = 666.

It is a super-3 number, since 3×21213554536242³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21213554536249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196421801208 + ... + 196421801315.

It is an arithmetic number, because the mean of its divisors is an integer number (2946327018930).

Almost surely, 2^{21213554536242} is an apocalyptic number.

21213554536242 is an abundant number, since it is smaller than the sum of its proper divisors (25927677766638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213554536242 is a wasteful number, since it uses less digits than its factorization.

21213554536242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392843602534 (or 392843602528 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The spelling of 21213554536242 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-four million, five hundred thirty-six thousand, two hundred forty-two".