821400748904 has 64 divisors (see below), whose sum is σ = 1638225388800. Its totient is φ = 384766377984.

The previous prime is 821400748901. The next prime is 821400748907. The reversal of 821400748904 is 409847004128.

It is an interprime number because it is at equal distance from previous prime (821400748901) and next prime (821400748907).

It is not an unprimeable number, because it can be changed into a prime (821400748901) by changing a digit.

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, 32094497 + ... + 32120079.

It is an arithmetic number, because the mean of its divisors is an integer number (25597271700).

Almost surely, 2^821400748904 is an apocalyptic number.

It is an amenable number.

821400748904 is a deficient number, since it is larger than the sum of its proper divisors (816824639896).

821400748904 is a wasteful number, since it uses less digits than its factorization.

821400748904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26682 (or 26678 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 821400748904 in words is "eight hundred twenty-one billion, four hundred million, seven hundred forty-eight thousand, nine hundred four".