21213011321101 has 4 divisors (see below), whose sum is σ = 21322923297052. Its totient is φ = 21103099345152.

The previous prime is 21213011321093. The next prime is 21213011321191. The reversal of 21213011321101 is 10112311031212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3615607175625 + 17597404145476 = 1901475^2 + 4194926^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213011321101 - 2³ = 21213011321093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213011321191) 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, 54955987686 + ... + 54955988071.

It is an arithmetic number, because the mean of its divisors is an integer number (5330730824263).

Almost surely, 2^{21213011321101} is an apocalyptic number.

It is an amenable number.

21213011321101 is a deficient number, since it is larger than the sum of its proper divisors (109911975951).

21213011321101 is a wasteful number, since it uses less digits than its factorization.

21213011321101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109911975950.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21213011321101 its reverse (10112311031212), we get a palindrome (31325322352313).

The spelling of 21213011321101 in words is "twenty-one trillion, two hundred thirteen billion, eleven million, three hundred twenty-one thousand, one hundred one".