202120051 has 6 divisors (see below), whose sum is σ = 235119300. Its totient is φ = 173245716.

The previous prime is 202119989. The next prime is 202120091. The reversal of 202120051 is 150021202.

It is not a de Polignac number, because 202120051 - 2⁷ = 202119923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2062401 + ... + 2062498.

It is an arithmetic number, because the mean of its divisors is an integer number (39186550).

Almost surely, 2^202120051 is an apocalyptic number.

202120051 is a deficient number, since it is larger than the sum of its proper divisors (32999249).

202120051 is an equidigital number, since it uses as much as digits as its factorization.

202120051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124913 (or 4124906 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 202120051 is about 14216.8931556793. The cubic root of 202120051 is about 586.8626446166.

Adding to 202120051 its reverse (150021202), we get a palindrome (352141253).

The spelling of 202120051 in words is "two hundred two million, one hundred twenty thousand, fifty-one".