2215216046521 has 2 divisors, whose sum is σ = 2215216046522. Its totient is φ = 2215216046520.

The previous prime is 2215216046507. The next prime is 2215216046551. The reversal of 2215216046521 is 1256406125122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2043541725625 + 171674320896 = 1429525^2 + 414336^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215216046521 - 2¹⁷ = 2215215915449 is a prime.

It is not a weakly prime, because it can be changed into another prime (2215216046501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107608023260 + 1107608023261.

It is an arithmetic number, because the mean of its divisors is an integer number (1107608023261).

Almost surely, 2^{2215216046521} is an apocalyptic number.

It is an amenable number.

2215216046521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215216046521 is an equidigital number, since it uses as much as digits as its factorization.

2215216046521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 2215216046521 in words is "two trillion, two hundred fifteen billion, two hundred sixteen million, forty-six thousand, five hundred twenty-one".