821950990440 has 32 divisors (see below), whose sum is σ = 2465852971680. Its totient is φ = 219186930752.

The previous prime is 821950990337. The next prime is 821950990451. The reversal of 821950990440 is 44099059128.

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, 3424795674 + ... + 3424795913.

It is an arithmetic number, because the mean of its divisors is an integer number (77057905365).

Almost surely, 2^821950990440 is an apocalyptic number.

It is an amenable number.

821950990440 is an abundant number, since it is smaller than the sum of its proper divisors (1643901981240).

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

821950990440 is a wasteful number, since it uses less digits than its factorization.

821950990440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6849591601 (or 6849591597 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 821950990440 in words is "eight hundred twenty-one billion, nine hundred fifty million, nine hundred ninety thousand, four hundred forty".