202121345 has 8 divisors (see below), whose sum is σ = 242661480. Its totient is φ = 161619840.

The previous prime is 202121323. The next prime is 202121377. The reversal of 202121345 is 543121202.

It can be written as a sum of positive squares in 4 ways, for example, as 16507969 + 185613376 = 4063^2 + 13624^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202121345 - 2¹⁴ = 202104961 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3485 + ... + 20405.

It is an arithmetic number, because the mean of its divisors is an integer number (30332685).

Almost surely, 2^202121345 is an apocalyptic number.

It is an amenable number.

202121345 is a deficient number, since it is larger than the sum of its proper divisors (40540135).

202121345 is a wasteful number, since it uses less digits than its factorization.

202121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19315.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 202121345 is about 14216.9386648462. The cubic root of 202121345 is about 586.8638970054.

Adding to 202121345 its reverse (543121202), we get a palindrome (745242547).

The spelling of 202121345 in words is "two hundred two million, one hundred twenty-one thousand, three hundred forty-five".