21235731735 has 32 divisors (see below), whose sum is σ = 34224952320. Its totient is φ = 11243232000.

The previous prime is 21235731731. The next prime is 21235731779. The reversal of 21235731735 is 53713753212.

It is not a de Polignac number, because 21235731735 - 2² = 21235731731 is a prime.

It is a super-2 number, since 2×21235731735² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21235731693 and 21235731702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235731731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5708206 + ... + 5711924.

It is an arithmetic number, because the mean of its divisors is an integer number (1069529760).

Almost surely, 2^21235731735 is an apocalyptic number.

21235731735 is a deficient number, since it is larger than the sum of its proper divisors (12989220585).

21235731735 is a wasteful number, since it uses less digits than its factorization.

21235731735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399.

The product of its digits is 132300, while the sum is 39.

The spelling of 21235731735 in words is "twenty-one billion, two hundred thirty-five million, seven hundred thirty-one thousand, seven hundred thirty-five".