202120417 has 2 divisors, whose sum is σ = 202120418. Its totient is φ = 202120416.

The previous prime is 202120411. The next prime is 202120421. The reversal of 202120417 is 714021202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193877776 + 8242641 = 13924^2 + 2871^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120417 - 2³ = 202120409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202120394 and 202120403.

It is not a weakly prime, because it can be changed into another prime (202120411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060208 + 101060209.

It is an arithmetic number, because the mean of its divisors is an integer number (101060209).

Almost surely, 2^202120417 is an apocalyptic number.

It is an amenable number.

202120417 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120417 is an equidigital number, since it uses as much as digits as its factorization.

202120417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 202120417 is about 14216.9060276841. The cubic root of 202120417 is about 586.8629988476.

Adding to 202120417 its reverse (714021202), we get a palindrome (916141619).

The spelling of 202120417 in words is "two hundred two million, one hundred twenty thousand, four hundred seventeen".