21112205235 has 144 divisors (see below), whose sum is σ = 39150173664. Its totient is φ = 9701120000.

The previous prime is 21112205209. The next prime is 21112205237. The reversal of 21112205235 is 53250221112.

It is not a de Polignac number, because 21112205235 - 2¹¹ = 21112203187 is a prime.

It is a super-2 number, since 2×21112205235² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21112205237) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 209031685 + ... + 209031785.

It is an arithmetic number, because the mean of its divisors is an integer number (271876206).

Almost surely, 2^21112205235 is an apocalyptic number.

21112205235 is a deficient number, since it is larger than the sum of its proper divisors (18037968429).

21112205235 is a wasteful number, since it uses less digits than its factorization.

21112205235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21112205235 its reverse (53250221112), we get a palindrome (74362426347).

The spelling of 21112205235 in words is "twenty-one billion, one hundred twelve million, two hundred five thousand, two hundred thirty-five".