21213442523201 has 4 divisors (see below), whose sum is σ = 21213586200000. Its totient is φ = 21213298846404.

The previous prime is 21213442523123. The next prime is 21213442523227. The reversal of 21213442523201 is 10232524431212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21213442523201 - 2³⁸ = 20938564616257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213442523101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71616701 + ... + 71912298.

It is an arithmetic number, because the mean of its divisors is an integer number (5303396550000).

Almost surely, 2^{21213442523201} is an apocalyptic number.

It is an amenable number.

21213442523201 is a deficient number, since it is larger than the sum of its proper divisors (143676799).

21213442523201 is a wasteful number, since it uses less digits than its factorization.

21213442523201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143676798.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21213442523201 its reverse (10232524431212), we get a palindrome (31445966954413).

The spelling of 21213442523201 in words is "twenty-one trillion, two hundred thirteen billion, four hundred forty-two million, five hundred twenty-three thousand, two hundred one".