21113125253 has 8 divisors (see below), whose sum is σ = 23034743616. Its totient is φ = 19191880800.

The previous prime is 21113125213. The next prime is 21113125277. The reversal of 21113125253 is 35252131112.

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 21113125253 - 2²⁰ = 21112076677 is a prime.

It is a super-3 number, since 3×21113125253³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113125213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31913 + ... + 207953.

It is an arithmetic number, because the mean of its divisors is an integer number (2879342952).

Almost surely, 2^21113125253 is an apocalyptic number.

It is an amenable number.

21113125253 is a deficient number, since it is larger than the sum of its proper divisors (1921618363).

21113125253 is a wasteful number, since it uses less digits than its factorization.

21113125253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186955.

The product of its digits is 1800, while the sum is 26.

Adding to 21113125253 its reverse (35252131112), we get a palindrome (56365256365).

The spelling of 21113125253 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty-five thousand, two hundred fifty-three".