21331026036542 has 8 divisors (see below), whose sum is σ = 33028685476032. Its totient is φ = 10321464211200.

The previous prime is 21331026036539. The next prime is 21331026036577. The reversal of 21331026036542 is 24563062013312.

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

It is a junction number, because it is equal to n+sod(n) for n = 21331026036496 and 21331026036505.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 172024403459 + ... + 172024403582.

It is an arithmetic number, because the mean of its divisors is an integer number (4128585684504).

Almost surely, 2^{21331026036542} is an apocalyptic number.

21331026036542 is a deficient number, since it is larger than the sum of its proper divisors (11697659439490).

21331026036542 is a wasteful number, since it uses less digits than its factorization.

21331026036542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344048807074.

The product of its (nonzero) digits is 155520, while the sum is 38.

Adding to 21331026036542 its reverse (24563062013312), we get a palindrome (45894088049854).

The spelling of 21331026036542 in words is "twenty-one trillion, three hundred thirty-one billion, twenty-six million, thirty-six thousand, five hundred forty-two".