21802855215 has 32 divisors (see below), whose sum is σ = 37083868416. Its totient is φ = 10900544000.

The previous prime is 21802855199. The next prime is 21802855223. The reversal of 21802855215 is 51255820812.

It is not a de Polignac number, because 21802855215 - 2⁴ = 21802855199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106317 + ... + 234326.

It is an arithmetic number, because the mean of its divisors is an integer number (1158870888).

Almost surely, 2^21802855215 is an apocalyptic number.

21802855215 is a deficient number, since it is larger than the sum of its proper divisors (15281013201).

21802855215 is a wasteful number, since it uses less digits than its factorization.

21802855215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340919.

The product of its (nonzero) digits is 64000, while the sum is 39.

The spelling of 21802855215 in words is "twenty-one billion, eight hundred two million, eight hundred fifty-five thousand, two hundred fifteen".