21455515240102 has 16 divisors (see below), whose sum is σ = 33388384896000. Its totient is φ = 10329531565320.

The previous prime is 21455515240097. The next prime is 21455515240121. The reversal of 21455515240102 is 20104251555412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869476852 + ... + 869501527.

It is an arithmetic number, because the mean of its divisors is an integer number (2086774056000).

Almost surely, 2^{21455515240102} is an apocalyptic number.

21455515240102 is a deficient number, since it is larger than the sum of its proper divisors (11932869655898).

21455515240102 is a wasteful number, since it uses less digits than its factorization.

21455515240102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738978611.

The product of its (nonzero) digits is 80000, while the sum is 37.

Adding to 21455515240102 its reverse (20104251555412), we get a palindrome (41559766795514).

The spelling of 21455515240102 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred fifteen million, two hundred forty thousand, one hundred two".