21213442523055 has 32 divisors (see below), whose sum is σ = 34046214451200. Its totient is φ = 11278952698112.

The previous prime is 21213442523051. The next prime is 21213442523093. The reversal of 21213442523055 is 55032524431212.

It is a cyclic number.

It is not a de Polignac number, because 21213442523055 - 2² = 21213442523051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213442523051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17501827 + ... + 18674603.

It is an arithmetic number, because the mean of its divisors is an integer number (1063944201600).

Almost surely, 2^{21213442523055} is an apocalyptic number.

21213442523055 is a deficient number, since it is larger than the sum of its proper divisors (12832771928145).

21213442523055 is a wasteful number, since it uses less digits than its factorization.

21213442523055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176503.

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21213442523055 its reverse (55032524431212), we get a palindrome (76245966954267).

The spelling of 21213442523055 in words is "twenty-one trillion, two hundred thirteen billion, four hundred forty-two million, five hundred twenty-three thousand, fifty-five".