202021434 has 12 divisors (see below), whose sum is σ = 437713146. Its totient is φ = 67340472.

The previous prime is 202021429. The next prime is 202021493. The reversal of 202021434 is 434120202.

It can be written as a sum of positive squares in only one way, i.e., 170380809 + 31640625 = 13053^2 + 5625^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11223413 = 202021434 / (2 + 0 + 2 + 0 + 2 + 1 + 4 + 3 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5611689 + ... + 5611724.

Almost surely, 2^202021434 is an apocalyptic number.

202021434 is an abundant number, since it is smaller than the sum of its proper divisors (235691712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202021434 is a wasteful number, since it uses less digits than its factorization.

202021434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11223421 (or 11223418 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 202021434 is about 14213.4244290389. The cubic root of 202021434 is about 586.7671831185.

Adding to 202021434 its reverse (434120202), we get a palindrome (636141636).

The spelling of 202021434 in words is "two hundred two million, twenty-one thousand, four hundred thirty-four".