21204041234 has 16 divisors (see below), whose sum is σ = 32861729472. Its totient is φ = 10254919248.

The previous prime is 21204041233. The next prime is 21204041239. The reversal of 21204041234 is 43214040212.

It is a super-2 number, since 2×21204041234² (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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1188029 + ... + 1205744.

It is an arithmetic number, because the mean of its divisors is an integer number (2053858092).

Almost surely, 2^21204041234 is an apocalyptic number.

21204041234 is a deficient number, since it is larger than the sum of its proper divisors (11657688238).

21204041234 is a wasteful number, since it uses less digits than its factorization.

21204041234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393921.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21204041234 its reverse (43214040212), we get a palindrome (64418081446).

The spelling of 21204041234 in words is "twenty-one billion, two hundred four million, forty-one thousand, two hundred thirty-four".