2235220721 has 2 divisors, whose sum is σ = 2235220722. Its totient is φ = 2235220720.

The previous prime is 2235220717. The next prime is 2235220747. The reversal of 2235220721 is 1270225322.

It is an a-pointer prime, because the next prime (2235220747) can be obtained adding 2235220721 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2046295696 + 188925025 = 45236^2 + 13745^2 .

It is a cyclic number.

It is not a de Polignac number, because 2235220721 - 2² = 2235220717 is a prime.

It is not a weakly prime, because it can be changed into another prime (2235220751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1117610360 + 1117610361.

It is an arithmetic number, because the mean of its divisors is an integer number (1117610361).

Almost surely, 2^2235220721 is an apocalyptic number.

It is an amenable number.

2235220721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2235220721 is an equidigital number, since it uses as much as digits as its factorization.

2235220721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2235220721 is about 47278.1209546234. The cubic root of 2235220721 is about 1307.4953056119.

The spelling of 2235220721 in words is "two billion, two hundred thirty-five million, two hundred twenty thousand, seven hundred twenty-one".