21122420450115 has 96 divisors (see below), whose sum is σ = 36340970664960. Its totient is φ = 10473153140736.

The previous prime is 21122420450099. The next prime is 21122420450221. The reversal of 21122420450115 is 51105402422112.

It is not a de Polignac number, because 21122420450115 - 2⁴ = 21122420450099 is a prime.

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 95 ways as a sum of consecutive naturals, for example, 177202906 + ... + 177322064.

It is an arithmetic number, because the mean of its divisors is an integer number (378551777760).

Almost surely, 2^{21122420450115} is an apocalyptic number.

21122420450115 is a deficient number, since it is larger than the sum of its proper divisors (15218550214845).

21122420450115 is a wasteful number, since it uses less digits than its factorization.

21122420450115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119701 (or 119684 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

Adding to 21122420450115 its reverse (51105402422112), we get a palindrome (72227822872227).

The spelling of 21122420450115 in words is "twenty-one trillion, one hundred twenty-two billion, four hundred twenty million, four hundred fifty thousand, one hundred fifteen".