202152318421 has 2 divisors, whose sum is σ = 202152318422. Its totient is φ = 202152318420.

The previous prime is 202152318377. The next prime is 202152318437. The reversal of 202152318421 is 124813251202.

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., 102240062500 + 99912255921 = 319750^2 + 316089^2 .

It is a cyclic number.

It is not a de Polignac number, because 202152318421 - 2⁷ = 202152318293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202152318491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101076159210 + 101076159211.

It is an arithmetic number, because the mean of its divisors is an integer number (101076159211).

Almost surely, 2^202152318421 is an apocalyptic number.

It is an amenable number.

202152318421 is a deficient number, since it is larger than the sum of its proper divisors (1).

202152318421 is an equidigital number, since it uses as much as digits as its factorization.

202152318421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 202152318421 its reverse (124813251202), we get a palindrome (326965569623).

The spelling of 202152318421 in words is "two hundred two billion, one hundred fifty-two million, three hundred eighteen thousand, four hundred twenty-one".