2021431530040 has 128 divisors (see below), whose sum is σ = 5169710145600. Its totient is φ = 705194864640.

The previous prime is 2021431529939. The next prime is 2021431530043. The reversal of 2021431530040 is 400351341202.

It is a junction number, because it is equal to n+sod(n) for n = 2021431529987 and 2021431530014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021431530043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3410980 + ... + 3959500.

Almost surely, 2^{2021431530040} is an apocalyptic number.

2021431530040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021431530040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2584855072800).

2021431530040 is an abundant number, since it is smaller than the sum of its proper divisors (3148278615560).

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

2021431530040 is a wasteful number, since it uses less digits than its factorization.

2021431530040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548937 (or 548933 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 2021431530040 its reverse (400351341202), we get a palindrome (2421782871242).

The spelling of 2021431530040 in words is "two trillion, twenty-one billion, four hundred thirty-one million, five hundred thirty thousand, forty".