2102345221 has 2 divisors, whose sum is σ = 2102345222. Its totient is φ = 2102345220.

The previous prime is 2102345209. The next prime is 2102345303. The reversal of 2102345221 is 1225432012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1875842721 + 226502500 = 43311^2 + 15050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102345221 - 2²¹ = 2100248069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102345192 and 2102345201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102345621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051172610 + 1051172611.

It is an arithmetic number, because the mean of its divisors is an integer number (1051172611).

Almost surely, 2^2102345221 is an apocalyptic number.

It is an amenable number.

2102345221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102345221 is an equidigital number, since it uses as much as digits as its factorization.

2102345221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2102345221 is about 45851.3382683646. The cubic root of 2102345221 is about 1281.0556925850.

Adding to 2102345221 its reverse (1225432012), we get a palindrome (3327777233).

The spelling of 2102345221 in words is "two billion, one hundred two million, three hundred forty-five thousand, two hundred twenty-one".