21211206135773 has 8 divisors (see below), whose sum is σ = 21466962608448. Its totient is φ = 20955454419744.

The previous prime is 21211206135739. The next prime is 21211206135793. The reversal of 21211206135773 is 37753160211212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21211206135773 - 2⁸ = 21211206135517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211206135773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211206135793) 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, 8230265 + ... + 10495697.

It is an arithmetic number, because the mean of its divisors is an integer number (2683370326056).

Almost surely, 2^{21211206135773} is an apocalyptic number.

It is an amenable number.

21211206135773 is a deficient number, since it is larger than the sum of its proper divisors (255756472675).

21211206135773 is a wasteful number, since it uses less digits than its factorization.

21211206135773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378323.

The product of its (nonzero) digits is 105840, while the sum is 41.

Adding to 21211206135773 its reverse (37753160211212), we get a palindrome (58964366346985).

The spelling of 21211206135773 in words is "twenty-one trillion, two hundred eleven billion, two hundred six million, one hundred thirty-five thousand, seven hundred seventy-three".