821399192802 has 32 divisors (see below), whose sum is σ = 1838655144000. Its totient is φ = 271801190304.

The previous prime is 821399192791. The next prime is 821399192807. The reversal of 821399192802 is 208291993128.

It is a super-2 number, since 2×821399192802² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (821399192807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55507552 + ... + 55522347.

It is an arithmetic number, because the mean of its divisors is an integer number (57457973250).

Almost surely, 2^821399192802 is an apocalyptic number.

821399192802 is an abundant number, since it is smaller than the sum of its proper divisors (1017255951198).

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

821399192802 is a wasteful number, since it uses less digits than its factorization.

821399192802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111030047 (or 111030041 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 821399192802 in words is "eight hundred twenty-one billion, three hundred ninety-nine million, one hundred ninety-two thousand, eight hundred two".