202021145 has 16 divisors (see below), whose sum is σ = 250644240. Its totient is φ = 156211200.

The previous prime is 202021139. The next prime is 202021151. The reversal of 202021145 is 541120202.

It is an interprime number because it is at equal distance from previous prime (202021139) and next prime (202021151).

It can be written as a sum of positive squares in 8 ways, for example, as 1968409 + 200052736 = 1403^2 + 14144^2 .

It is a de Polignac number, because none of the positive numbers 2^k-202021145 is a prime.

It is a super-2 number, since 2×202021145² = 81625086054222050, which contains 22 as substring.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 17825 + ... + 26865.

It is an arithmetic number, because the mean of its divisors is an integer number (15665265).

Almost surely, 2^202021145 is an apocalyptic number.

It is an amenable number.

202021145 is a deficient number, since it is larger than the sum of its proper divisors (48623095).

202021145 is a wasteful number, since it uses less digits than its factorization.

202021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 202021145 is about 14213.4142625901. The cubic root of 202021145 is about 586.7669033202.

Adding to 202021145 its reverse (541120202), we get a palindrome (743141347).

The spelling of 202021145 in words is "two hundred two million, twenty-one thousand, one hundred forty-five".