821487218742 has 16 divisors (see below), whose sum is σ = 1825527152880. Its totient is φ = 273829072896.

The previous prime is 821487218729. The next prime is 821487218743. The reversal of 821487218742 is 247812784128.

821487218742 is a `hidden beast` number, since 8 + 21 + 487 + 21 + 87 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 15212726273 = 821487218742 / (8 + 2 + 1 + 4 + 8 + 7 + 2 + 1 + 8 + 7 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821487218743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7606363083 + ... + 7606363190.

It is an arithmetic number, because the mean of its divisors is an integer number (114095447055).

Almost surely, 2^821487218742 is an apocalyptic number.

821487218742 is an abundant number, since it is smaller than the sum of its proper divisors (1004039934138).

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

821487218742 is a wasteful number, since it uses less digits than its factorization.

821487218742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15212726284 (or 15212726278 counting only the distinct ones).

The product of its digits is 3211264, while the sum is 54.

The spelling of 821487218742 in words is "eight hundred twenty-one billion, four hundred eighty-seven million, two hundred eighteen thousand, seven hundred forty-two".