12981029450 has 24 divisors (see below), whose sum is σ = 24151370508. Its totient is φ = 5190980480.

The previous prime is 12981029449. The next prime is 12981029461. The reversal of 12981029450 is 5492018921.

It can be written as a sum of positive squares in 6 ways, for example, as 3723318361 + 9257711089 = 61019^2 + 96217^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12981029398 and 12981029407.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157784 + ... + 225516.

Almost surely, 2^12981029450 is an apocalyptic number.

12981029450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12981029450 is a deficient number, since it is larger than the sum of its proper divisors (11170341058).

12981029450 is a wasteful number, since it uses less digits than its factorization.

12981029450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71578 (or 71573 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 12981029450 in words is "twelve billion, nine hundred eighty-one million, twenty-nine thousand, four hundred fifty".