21213544054606 has 4 divisors (see below), whose sum is σ = 31820316081912. Its totient is φ = 10606772027302.

The previous prime is 21213544054603. The next prime is 21213544054649. The reversal of 21213544054606 is 60645044531212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213544054603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303386013650 + ... + 5303386013653.

It is an arithmetic number, because the mean of its divisors is an integer number (7955079020478).

Almost surely, 2^{21213544054606} is an apocalyptic number.

21213544054606 is a deficient number, since it is larger than the sum of its proper divisors (10606772027306).

21213544054606 is a wasteful number, since it uses less digits than its factorization.

21213544054606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606772027305.

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 21213544054606 its reverse (60645044531212), we get a palindrome (81858588585818).

The spelling of 21213544054606 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-four million, fifty-four thousand, six hundred six".