842396951021 has 4 divisors (see below), whose sum is σ = 842409302844. Its totient is φ = 842384599200.

The previous prime is 842396951017. The next prime is 842396951029. The reversal of 842396951021 is 120159693248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100989848521 + 741407102500 = 317789^2 + 861050^2 .

It is a cyclic number.

It is not a de Polignac number, because 842396951021 - 2² = 842396951017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842396951029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6073040 + ... + 6210201.

It is an arithmetic number, because the mean of its divisors is an integer number (210602325711).

Almost surely, 2^842396951021 is an apocalyptic number.

It is an amenable number.

842396951021 is a deficient number, since it is larger than the sum of its proper divisors (12351823).

842396951021 is a wasteful number, since it uses less digits than its factorization.

842396951021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12351822.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 842396951021 in words is "eight hundred forty-two billion, three hundred ninety-six million, nine hundred fifty-one thousand, twenty-one".