21113353361253 has 8 divisors (see below), whose sum is σ = 28193726528416. Its totient is φ = 14054274550800.

The previous prime is 21113353361209. The next prime is 21113353361363. The reversal of 21113353361253 is 35216335331112.

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

It is not a de Polignac number, because 21113353361253 - 2¹⁶ = 21113353295717 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 (21113353361153) 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, 5323586863 + ... + 5323590828.

It is an arithmetic number, because the mean of its divisors is an integer number (3524215816052).

Almost surely, 2^{21113353361253} is an apocalyptic number.

It is an amenable number.

21113353361253 is a deficient number, since it is larger than the sum of its proper divisors (7080373167163).

21113353361253 is a wasteful number, since it uses less digits than its factorization.

21113353361253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647178355.

The product of its digits is 145800, while the sum is 39.

Adding to 21113353361253 its reverse (35216335331112), we get a palindrome (56329688692365).

The spelling of 21113353361253 in words is "twenty-one trillion, one hundred thirteen billion, three hundred fifty-three million, three hundred sixty-one thousand, two hundred fifty-three".