842121512 has 8 divisors (see below), whose sum is σ = 1578977850. Its totient is φ = 421060752.

The previous prime is 842121499. The next prime is 842121547. The reversal of 842121512 is 215121248.

It can be written as a sum of positive squares in only one way, i.e., 830246596 + 11874916 = 28814^2 + 3446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×842121512² = 1418337281946332288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52632587 + ... + 52632602.

Almost surely, 2^842121512 is an apocalyptic number.

It is an amenable number.

842121512 is a deficient number, since it is larger than the sum of its proper divisors (736856338).

842121512 is a wasteful number, since it uses less digits than its factorization.

842121512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105265195 (or 105265191 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 842121512 is about 29019.3299715896. The cubic root of 842121512 is about 944.3324651283.

The spelling of 842121512 in words is "eight hundred forty-two million, one hundred twenty-one thousand, five hundred twelve".