1285221461242 has 16 divisors (see below), whose sum is σ = 2062277741160. Its totient is φ = 598574942208.

The previous prime is 1285221461221. The next prime is 1285221461291. The reversal of 1285221461242 is 2421641225821.

It can be written as a sum of positive squares in 4 ways, for example, as 1105944586321 + 179276874921 = 1051639^2 + 423411^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1285221461195 and 1285221461204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194845317 + ... + 194851912.

Almost surely, 2^{1285221461242} is an apocalyptic number.

1285221461242 is a deficient number, since it is larger than the sum of its proper divisors (777056279918).

1285221461242 is a wasteful number, since it uses less digits than its factorization.

1285221461242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389697345.

The product of its digits is 122880, while the sum is 40.

The spelling of 1285221461242 in words is "one trillion, two hundred eighty-five billion, two hundred twenty-one million, four hundred sixty-one thousand, two hundred forty-two".