21204041235 has 32 divisors (see below), whose sum is σ = 36552327168. Its totient is φ = 10434303360.

The previous prime is 21204041233. The next prime is 21204041239. The reversal of 21204041235 is 53214040212.

It is not a de Polignac number, because 21204041235 - 2¹ = 21204041233 is a prime.

It is a super-2 number, since 2×21204041235² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204041233) 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, 441870 + ... + 487500.

It is an arithmetic number, because the mean of its divisors is an integer number (1142260224).

Almost surely, 2^21204041235 is an apocalyptic number.

21204041235 is a deficient number, since it is larger than the sum of its proper divisors (15348285933).

21204041235 is a wasteful number, since it uses less digits than its factorization.

21204041235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48035.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21204041235 its reverse (53214040212), we get a palindrome (74418081447).

The spelling of 21204041235 in words is "twenty-one billion, two hundred four million, forty-one thousand, two hundred thirty-five".