2021121000040 has 32 divisors (see below), whose sum is σ = 4549899590280. Its totient is φ = 808025761792.

The previous prime is 2021120999999. The next prime is 2021121000091. The reversal of 2021121000040 is 400001211202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1671605924836 + 349515075204 = 1292906^2 + 591198^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13129969 + ... + 13283008.

Almost surely, 2^{2021121000040} is an apocalyptic number.

2021121000040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021121000040 is an abundant number, since it is smaller than the sum of its proper divisors (2528778590240).

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

2021121000040 is a wasteful number, since it uses less digits than its factorization.

2021121000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26414901 (or 26414897 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021121000040 its reverse (400001211202), we get a palindrome (2421122211242).

The spelling of 2021121000040 in words is "two trillion, twenty-one billion, one hundred twenty-one million, forty", and thus it is an aban number.