20721135023235 has 32 divisors (see below), whose sum is σ = 36837852480000. Its totient is φ = 11051188280928.

The previous prime is 20721135023231. The next prime is 20721135023269. The reversal of 20721135023235 is 53232053112702.

20721135023235 is a `hidden beast` number, since 2 + 0 + 7 + 2 + 113 + 502 + 3 + 2 + 35 = 666.

It is not a de Polignac number, because 20721135023235 - 2² = 20721135023231 is a prime.

It is a super-2 number, since 2×20721135023235² (a number of 27 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 20721135023235.

It is not an unprimeable number, because it can be changed into a prime (20721135023231) 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, 19987296 + ... + 20998434.

It is an arithmetic number, because the mean of its divisors is an integer number (1151182890000).

Almost surely, 2^{20721135023235} is an apocalyptic number.

20721135023235 is a deficient number, since it is larger than the sum of its proper divisors (16116717456765).

20721135023235 is a wasteful number, since it uses less digits than its factorization.

20721135023235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162952 (or 1162946 counting only the distinct ones).

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

Adding to 20721135023235 its reverse (53232053112702), we get a palindrome (73953188135937).

The spelling of 20721135023235 in words is "twenty trillion, seven hundred twenty-one billion, one hundred thirty-five million, twenty-three thousand, two hundred thirty-five".