930842780021 has 20 divisors (see below), whose sum is σ = 1184638537344. Its totient is φ = 725332015800.

The previous prime is 930842780017. The next prime is 930842780057. The reversal of 930842780021 is 120087248039.

It is not a de Polignac number, because 930842780021 - 2² = 930842780017 is a prime.

It is a super-2 number, since 2×930842780021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (930842780321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17595845 + ... + 17648666.

Almost surely, 2^930842780021 is an apocalyptic number.

It is an amenable number.

930842780021 is a deficient number, since it is larger than the sum of its proper divisors (253795757323).

930842780021 is an equidigital number, since it uses as much as digits as its factorization.

930842780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35244550 (or 35244529 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 930842780021 in words is "nine hundred thirty billion, eight hundred forty-two million, seven hundred eighty thousand, twenty-one".