13121861880 has 48 divisors (see below), whose sum is σ = 39369350520. Its totient is φ = 3498828544.

The previous prime is 13121861873. The next prime is 13121861887. The reversal of 13121861880 is 8816812131.

It is an interprime number because it is at equal distance from previous prime (13121861873) and next prime (13121861887).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121861887) 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 11 ways as a sum of consecutive naturals, for example, 1249612 + ... + 1260068.

Almost surely, 2^13121861880 is an apocalyptic number.

13121861880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121861880 is an abundant number, since it is smaller than the sum of its proper divisors (26247488640).

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

13121861880 is an frugal number, since it uses more digits than its factorization.

13121861880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20928 (or 10467 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The spelling of 13121861880 in words is "thirteen billion, one hundred twenty-one million, eight hundred sixty-one thousand, eight hundred eighty".