21550542032215 has 16 divisors (see below), whose sum is σ = 29555363363328. Its totient is φ = 14777347391136.

The previous prime is 21550542032209. The next prime is 21550542032221. The reversal of 21550542032215 is 51223024505512.

It is an interprime number because it is at equal distance from previous prime (21550542032209) and next prime (21550542032221).

It is a cyclic number.

It is not a de Polignac number, because 21550542032215 - 2⁵ = 21550542032183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302707 + ... + 6572116.

It is an arithmetic number, because the mean of its divisors is an integer number (1847210210208).

Almost surely, 2^{21550542032215} is an apocalyptic number.

21550542032215 is a deficient number, since it is larger than the sum of its proper divisors (8004821331113).

21550542032215 is an equidigital number, since it uses as much as digits as its factorization.

21550542032215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6964398.

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 21550542032215 its reverse (51223024505512), we get a palindrome (72773566537727).

The spelling of 21550542032215 in words is "twenty-one trillion, five hundred fifty billion, five hundred forty-two million, thirty-two thousand, two hundred fifteen".