21234153735 has 24 divisors (see below), whose sum is σ = 37588973760. Its totient is φ = 11083925952.

The previous prime is 21234153727. The next prime is 21234153757. The reversal of 21234153735 is 53735143212.

It is not a de Polignac number, because 21234153735 - 2³ = 21234153727 is a prime.

It is a super-2 number, since 2×21234153735² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21234153735.

It is a congruent number.

It is an unprimeable number.

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, 5017780 + ... + 5022009.

It is an arithmetic number, because the mean of its divisors is an integer number (1566207240).

Almost surely, 2^21234153735 is an apocalyptic number.

21234153735 is a deficient number, since it is larger than the sum of its proper divisors (16354820025).

21234153735 is a wasteful number, since it uses less digits than its factorization.

21234153735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10039847 (or 10039844 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

Adding to 21234153735 its reverse (53735143212), we get a palindrome (74969296947).

The spelling of 21234153735 in words is "twenty-one billion, two hundred thirty-four million, one hundred fifty-three thousand, seven hundred thirty-five".