202121404 has 6 divisors (see below), whose sum is σ = 353712464. Its totient is φ = 101060700.

The previous prime is 202121399. The next prime is 202121407. The reversal of 202121404 is 404121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25265172 + ... + 25265179.

Almost surely, 2^202121404 is an apocalyptic number.

It is an amenable number.

202121404 is a deficient number, since it is larger than the sum of its proper divisors (151591060).

202121404 is a wasteful number, since it uses less digits than its factorization.

202121404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50530355 (or 50530353 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 202121404 is about 14216.9407398357. The cubic root of 202121404 is about 586.8639541080.

Adding to 202121404 its reverse (404121202), we get a palindrome (606242606).

The spelling of 202121404 in words is "two hundred two million, one hundred twenty-one thousand, four hundred four".