2221215377 has 2 divisors, whose sum is σ = 2221215378. Its totient is φ = 2221215376.

The previous prime is 2221215341. The next prime is 2221215383. The reversal of 2221215377 is 7735121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2141005441 + 80209936 = 46271^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221215377 - 2²⁰ = 2220166801 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221215677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110607688 + 1110607689.

It is an arithmetic number, because the mean of its divisors is an integer number (1110607689).

Almost surely, 2^2221215377 is an apocalyptic number.

It is an amenable number.

2221215377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221215377 is an equidigital number, since it uses as much as digits as its factorization.

2221215377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 2221215377 is about 47129.7716629309. The cubic root of 2221215377 is about 1304.7587673283.

Adding to 2221215377 its reverse (7735121222), we get a palindrome (9956336599).

The spelling of 2221215377 in words is "two billion, two hundred twenty-one million, two hundred fifteen thousand, three hundred seventy-seven".