202121130440 has 32 divisors (see below), whose sum is σ = 454798844280. Its totient is φ = 80843776512.

The previous prime is 202121130433. The next prime is 202121130443. The reversal of 202121130440 is 44031121202.

It can be written as a sum of positive squares in 4 ways, for example, as 163702778404 + 38418352036 = 404602^2 + 196006^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (202121130443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601394 + ... + 875166.

Almost surely, 2^202121130440 is an apocalyptic number.

202121130440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121130440 is an abundant number, since it is smaller than the sum of its proper divisors (252677713840).

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

202121130440 is a wasteful number, since it uses less digits than its factorization.

202121130440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292241 (or 292237 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 202121130440 its reverse (44031121202), we get a palindrome (246152251642).

The spelling of 202121130440 in words is "two hundred two billion, one hundred twenty-one million, one hundred thirty thousand, four hundred forty".