2101241221 has 2 divisors, whose sum is σ = 2101241222. Its totient is φ = 2101241220.

The previous prime is 2101241209. The next prime is 2101241231. The reversal of 2101241221 is 1221421012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1721420100 + 379821121 = 41490^2 + 19489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101241221 - 2¹⁵ = 2101208453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101241195 and 2101241204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101241201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050620610 + 1050620611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050620611).

Almost surely, 2^2101241221 is an apocalyptic number.

It is an amenable number.

2101241221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101241221 is an equidigital number, since it uses as much as digits as its factorization.

2101241221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2101241221 is about 45839.2977803980. The cubic root of 2101241221 is about 1280.8314139869.

Adding to 2101241221 its reverse (1221421012), we get a palindrome (3322662233).

The spelling of 2101241221 in words is "two billion, one hundred one million, two hundred forty-one thousand, two hundred twenty-one".