21043042331435 has 8 divisors (see below), whose sum is σ = 25255631862240. Its totient is φ = 16831779822144.

The previous prime is 21043042331341. The next prime is 21043042331491. The reversal of 21043042331435 is 53413324034012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21043042331435 - 2⁴² = 16644995820331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043042331395 and 21043042331404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331720490 + ... + 331783919.

It is an arithmetic number, because the mean of its divisors is an integer number (3156953982780).

Almost surely, 2^{21043042331435} is an apocalyptic number.

21043042331435 is a deficient number, since it is larger than the sum of its proper divisors (4212589530805).

21043042331435 is an equidigital number, since it uses as much as digits as its factorization.

21043042331435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663510757.

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 21043042331435 its reverse (53413324034012), we get a palindrome (74456366365447).

The spelling of 21043042331435 in words is "twenty-one trillion, forty-three billion, forty-two million, three hundred thirty-one thousand, four hundred thirty-five".