21042434337 has 16 divisors (see below), whose sum is σ = 28343897088. Its totient is φ = 13884774480.

The previous prime is 21042434297. The next prime is 21042434351. The reversal of 21042434337 is 73343424012.

It is a happy number.

It is not a de Polignac number, because 21042434337 - 2¹¹ = 21042432289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21042434298 and 21042434307.

It is not an unprimeable number, because it can be changed into a prime (21042434137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604468 + ... + 638330.

It is an arithmetic number, because the mean of its divisors is an integer number (1771493568).

Almost surely, 2^21042434337 is an apocalyptic number.

It is an amenable number.

21042434337 is a deficient number, since it is larger than the sum of its proper divisors (7301462751).

21042434337 is a wasteful number, since it uses less digits than its factorization.

21042434337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35980.

The product of its (nonzero) digits is 48384, while the sum is 33.

Adding to 21042434337 its reverse (73343424012), we get a palindrome (94385858349).

The spelling of 21042434337 in words is "twenty-one billion, forty-two million, four hundred thirty-four thousand, three hundred thirty-seven".