21213543344054 has 16 divisors (see below), whose sum is σ = 33653812850880. Its totient is φ = 10000897207560.

The previous prime is 21213543344053. The next prime is 21213543344131. The reversal of 21213543344054 is 45044334531212.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213543344053) 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, 1322861984 + ... + 1322878019.

It is an arithmetic number, because the mean of its divisors is an integer number (2103363303180).

Almost surely, 2^{21213543344054} is an apocalyptic number.

21213543344054 is a deficient number, since it is larger than the sum of its proper divisors (12440269506826).

21213543344054 is a wasteful number, since it uses less digits than its factorization.

21213543344054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645740235.

The product of its (nonzero) digits is 691200, while the sum is 41.

Adding to 21213543344054 its reverse (45044334531212), we get a palindrome (66257877875266).

The spelling of 21213543344054 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred forty-four thousand, fifty-four".