12821809364 has 24 divisors (see below), whose sum is σ = 27616205568. Its totient is φ = 5072364000.

The previous prime is 12821809361. The next prime is 12821809367. The reversal of 12821809364 is 46390812821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12821809361) and next prime (12821809367).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821809361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17612012 + ... + 17612739.

It is an arithmetic number, because the mean of its divisors is an integer number (1150675232).

Almost surely, 2^12821809364 is an apocalyptic number.

12821809364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12821809364 is an abundant number, since it is smaller than the sum of its proper divisors (14794396204).

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

12821809364 is a wasteful number, since it uses less digits than its factorization.

12821809364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35224775 (or 35224773 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 12821809364 in words is "twelve billion, eight hundred twenty-one million, eight hundred nine thousand, three hundred sixty-four".