21113137275 has 24 divisors (see below), whose sum is σ = 34959005040. Its totient is φ = 11243581440.

The previous prime is 21113137271. The next prime is 21113137313. The reversal of 21113137275 is 57273131112.

It is not a de Polignac number, because 21113137275 - 2² = 21113137271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113137271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158670 + ... + 259619.

It is an arithmetic number, because the mean of its divisors is an integer number (1456625210).

Almost surely, 2^21113137275 is an apocalyptic number.

21113137275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21113137275 is a deficient number, since it is larger than the sum of its proper divisors (13845867765).

21113137275 is a wasteful number, since it uses less digits than its factorization.

21113137275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418975 (or 418970 counting only the distinct ones).

The product of its digits is 8820, while the sum is 33.

Adding to 21113137275 its reverse (57273131112), we get a palindrome (78386268387).

The spelling of 21113137275 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-seven thousand, two hundred seventy-five".