21004321434 has 32 divisors (see below), whose sum is σ = 43506529920. Its totient is φ = 6752340672.

The previous prime is 21004321337. The next prime is 21004321451. The reversal of 21004321434 is 43412340012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86292 + ... + 222384.

It is an arithmetic number, because the mean of its divisors is an integer number (1359579060).

Almost surely, 2^21004321434 is an apocalyptic number.

21004321434 is an abundant number, since it is smaller than the sum of its proper divisors (22502208486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21004321434 is a wasteful number, since it uses less digits than its factorization.

21004321434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137014.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21004321434 its reverse (43412340012), we get a palindrome (64416661446).

The spelling of 21004321434 in words is "twenty-one billion, four million, three hundred twenty-one thousand, four hundred thirty-four".