2113400221 has 2 divisors, whose sum is σ = 2113400222. Its totient is φ = 2113400220.

The previous prime is 2113400209. The next prime is 2113400239. The reversal of 2113400221 is 1220043112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1923787321 + 189612900 = 43861^2 + 13770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113400221 - 2²¹ = 2111303069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2113400195 and 2113400204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113400251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056700110 + 1056700111.

It is an arithmetic number, because the mean of its divisors is an integer number (1056700111).

Almost surely, 2^2113400221 is an apocalyptic number.

It is an amenable number.

2113400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113400221 is an equidigital number, since it uses as much as digits as its factorization.

2113400221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2113400221 is about 45971.7328474792. The cubic root of 2113400221 is about 1283.2972083083.

Adding to 2113400221 its reverse (1220043112), we get a palindrome (3333443333).

The spelling of 2113400221 in words is "two billion, one hundred thirteen million, four hundred thousand, two hundred twenty-one".