2215880320221 has 6 divisors (see below), whose sum is σ = 3200716018110. Its totient is φ = 1477253546808.

The previous prime is 2215880320193. The next prime is 2215880320249. The reversal of 2215880320221 is 1220230885122.

2215880320221 is a `hidden beast` number, since 2 + 21 + 588 + 0 + 32 + 0 + 2 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (2215880320193) and next prime (2215880320249).

It can be written as a sum of positive squares in only one way, i.e., 1630884797721 + 584995522500 = 1277061^2 + 764850^2 .

It is not a de Polignac number, because 2215880320221 - 2⁵ = 2215880320189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215880324221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123104462226 + ... + 123104462243.

It is an arithmetic number, because the mean of its divisors is an integer number (533452669685).

Almost surely, 2^{2215880320221} is an apocalyptic number.

It is an amenable number.

2215880320221 is a deficient number, since it is larger than the sum of its proper divisors (984835697889).

2215880320221 is a wasteful number, since it uses less digits than its factorization.

2215880320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246208924475 (or 246208924472 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 2215880320221 in words is "two trillion, two hundred fifteen billion, eight hundred eighty million, three hundred twenty thousand, two hundred twenty-one".