1285121729352 has 16 divisors (see below), whose sum is σ = 3212804323440. Its totient is φ = 428373909776.

The previous prime is 1285121729329. The next prime is 1285121729363. The reversal of 1285121729352 is 2539271215821.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26773369338 + ... + 26773369385.

It is an arithmetic number, because the mean of its divisors is an integer number (200800270215).

Almost surely, 2^{1285121729352} is an apocalyptic number.

1285121729352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1285121729352 is an abundant number, since it is smaller than the sum of its proper divisors (1927682594088).

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

1285121729352 is a wasteful number, since it uses less digits than its factorization.

1285121729352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53546738732 (or 53546738728 counting only the distinct ones).

The product of its digits is 604800, while the sum is 48.

The spelling of 1285121729352 in words is "one trillion, two hundred eighty-five billion, one hundred twenty-one million, seven hundred twenty-nine thousand, three hundred fifty-two".