821230641004 has 48 divisors (see below), whose sum is σ = 1522525334400. Its totient is φ = 386505133056.

The previous prime is 821230640977. The next prime is 821230641019. The reversal of 821230641004 is 400146032128.

It is a super-2 number, since 2×821230641004² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16531267 + ... + 16580869.

It is an arithmetic number, because the mean of its divisors is an integer number (31719277800).

Almost surely, 2^821230641004 is an apocalyptic number.

It is an amenable number.

821230641004 is a deficient number, since it is larger than the sum of its proper divisors (701294693396).

821230641004 is a wasteful number, since it uses less digits than its factorization.

821230641004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51022 (or 51020 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 821230641004 in words is "eight hundred twenty-one billion, two hundred thirty million, six hundred forty-one thousand, four".