202021404 has 72 divisors (see below), whose sum is σ = 539381808. Its totient is φ = 58490880.

The previous prime is 202021361. The next prime is 202021409. The reversal of 202021404 is 404120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021409) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 42844 + ... + 47324.

It is an arithmetic number, because the mean of its divisors is an integer number (7491414).

Almost surely, 2^202021404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202021404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269690904).

202021404 is an abundant number, since it is smaller than the sum of its proper divisors (337360404).

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

202021404 is a wasteful number, since it uses less digits than its factorization.

202021404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535 (or 4516 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 202021404 is about 14213.4233736985. The cubic root of 202021404 is about 586.7671540737.

Adding to 202021404 its reverse (404120202), we get a palindrome (606141606).

The spelling of 202021404 in words is "two hundred two million, twenty-one thousand, four hundred four".