21515410452255 has 16 divisors (see below), whose sum is σ = 34470988715520. Its totient is φ = 11459441577248.

The previous prime is 21515410452251. The next prime is 21515410452259. The reversal of 21515410452255 is 55225401451512.

It is an interprime number because it is at equal distance from previous prime (21515410452251) and next prime (21515410452259).

It is a cyclic number.

It is not a de Polignac number, because 21515410452255 - 2² = 21515410452251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515410452251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 965238315 + ... + 965260604.

It is an arithmetic number, because the mean of its divisors is an integer number (2154436794720).

Almost surely, 2^{21515410452255} is an apocalyptic number.

21515410452255 is a deficient number, since it is larger than the sum of its proper divisors (12955578263265).

21515410452255 is a wasteful number, since it uses less digits than its factorization.

21515410452255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930499670.

The product of its (nonzero) digits is 400000, while the sum is 42.

The spelling of 21515410452255 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, four hundred fifty-two thousand, two hundred fifty-five".