21531012443435 has 8 divisors (see below), whose sum is σ = 28186052653296. Its totient is φ = 15658918140640.

The previous prime is 21531012443431. The next prime is 21531012443443. The reversal of 21531012443435 is 53434421013512.

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

It is not a de Polignac number, because 21531012443435 - 2² = 21531012443431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21531012443431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195736476704 + ... + 195736476813.

It is an arithmetic number, because the mean of its divisors is an integer number (3523256581662).

Almost surely, 2^{21531012443435} is an apocalyptic number.

21531012443435 is a deficient number, since it is larger than the sum of its proper divisors (6655040209861).

21531012443435 is a wasteful number, since it uses less digits than its factorization.

21531012443435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391472953533.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 21531012443435 its reverse (53434421013512), we get a palindrome (74965433456947).

The spelling of 21531012443435 in words is "twenty-one trillion, five hundred thirty-one billion, twelve million, four hundred forty-three thousand, four hundred thirty-five".