21115737753 has 16 divisors (see below), whose sum is σ = 30716577216. Its totient is φ = 12796259840.

The previous prime is 21115737743. The next prime is 21115737763. The reversal of 21115737753 is 35773751112.

It is an interprime number because it is at equal distance from previous prime (21115737743) and next prime (21115737763).

It is a cyclic number.

It is not a de Polignac number, because 21115737753 - 2⁴ = 21115737737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21115737743) 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 15 ways as a sum of consecutive naturals, for example, 470125 + ... + 513077.

It is an arithmetic number, because the mean of its divisors is an integer number (1919786076).

Almost surely, 2^21115737753 is an apocalyptic number.

It is an amenable number.

21115737753 is a deficient number, since it is larger than the sum of its proper divisors (9600839463).

21115737753 is a wasteful number, since it uses less digits than its factorization.

21115737753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57864.

The product of its digits is 154350, while the sum is 42.

The spelling of 21115737753 in words is "twenty-one billion, one hundred fifteen million, seven hundred thirty-seven thousand, seven hundred fifty-three".