21156753135 has 64 divisors (see below), whose sum is σ = 39114243072. Its totient is φ = 9565295616.

The previous prime is 21156753133. The next prime is 21156753151. The reversal of 21156753135 is 53135765112.

It is not a de Polignac number, because 21156753135 - 2¹ = 21156753133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21156753093 and 21156753102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21156753133) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4068357 + ... + 4073553.

It is an arithmetic number, because the mean of its divisors is an integer number (611160048).

Almost surely, 2^21156753135 is an apocalyptic number.

21156753135 is a deficient number, since it is larger than the sum of its proper divisors (17957489937).

21156753135 is a wasteful number, since it uses less digits than its factorization.

21156753135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632.

The product of its digits is 94500, while the sum is 39.

The spelling of 21156753135 in words is "twenty-one billion, one hundred fifty-six million, seven hundred fifty-three thousand, one hundred thirty-five".