821401738979 has 8 divisors (see below), whose sum is σ = 824768442960. Its totient is φ = 818039523456.

The previous prime is 821401738973. The next prime is 821401738981. The reversal of 821401738979 is 979837104128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 821401738979 - 2³² = 817106771683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821401738973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 755114 + ... + 1487615.

It is an arithmetic number, because the mean of its divisors is an integer number (103096055370).

Almost surely, 2^821401738979 is an apocalyptic number.

821401738979 is a deficient number, since it is larger than the sum of its proper divisors (3366703981).

821401738979 is a wasteful number, since it uses less digits than its factorization.

821401738979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244229.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 821401738979 in words is "eight hundred twenty-one billion, four hundred one million, seven hundred thirty-eight thousand, nine hundred seventy-nine".