202121442 has 24 divisors (see below), whose sum is σ = 439818444. Its totient is φ = 67083264.

The previous prime is 202121407. The next prime is 202121453. The reversal of 202121442 is 244121202.

202121442 is a `hidden beast` number, since 202 + 1 + 21 + 442 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 201952521 + 168921 = 14211^2 + 411^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19903 + ... + 28290.

Almost surely, 2^202121442 is an apocalyptic number.

202121442 is an abundant number, since it is smaller than the sum of its proper divisors (237697002).

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

202121442 is a wasteful number, since it uses less digits than its factorization.

202121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48434 (or 48431 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 202121442 is about 14216.9420762694. The cubic root of 202121442 is about 586.8639908859.

Adding to 202121442 its reverse (244121202), we get a palindrome (446242644).

The spelling of 202121442 in words is "two hundred two million, one hundred twenty-one thousand, four hundred forty-two".