12421000000 has 98 divisors (see below), whose sum is σ = 30811988414. Its totient is φ = 4968000000.

The previous prime is 12420999977. The next prime is 12421000013. The reversal of 12421000000 is 12421.

It can be written as a sum of positive squares in 7 ways, for example, as 11538197056 + 882802944 = 107416^2 + 29712^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 993790 + ... + 1006210.

Almost surely, 2^12421000000 is an apocalyptic number.

12421000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12421000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15405994207).

12421000000 is an abundant number, since it is smaller than the sum of its proper divisors (18390988414).

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

12421000000 is an frugal number, since it uses more digits than its factorization.

12421000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12463 (or 12428 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 12421000000 its reverse (12421), we get a palindrome (12421012421).

Multiplying 12421000000 by its reverse (12421), we get a square (154281241000000 = 12421000²).

12421000000 divided by its reverse (12421) gives a 6-th power (1000000 = 10⁶).

The spelling of 12421000000 in words is "twelve billion, four hundred twenty-one million", and thus it is an aban number.