1281427212028 has 24 divisors (see below), whose sum is σ = 2276668935632. Its totient is φ = 630956265984.

The previous prime is 1281427212011. The next prime is 1281427212199. The reversal of 1281427212028 is 8202127241821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136876 + ... + 1606732.

Almost surely, 2^{1281427212028} is an apocalyptic number.

It is an amenable number.

1281427212028 is a deficient number, since it is larger than the sum of its proper divisors (995241723604).

1281427212028 is a wasteful number, since it uses less digits than its factorization.

1281427212028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473181 (or 1473179 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The spelling of 1281427212028 in words is "one trillion, two hundred eighty-one billion, four hundred twenty-seven million, two hundred twelve thousand, twenty-eight".