1021917842 has 16 divisors (see below), whose sum is σ = 1686053664. Its totient is φ = 464506900.

The previous prime is 1021917817. The next prime is 1021917877. The reversal of 1021917842 is 2487191201.

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, 189284 + ... + 194607.

It is an arithmetic number, because the mean of its divisors is an integer number (105378354).

Almost surely, 2^1021917842 is an apocalyptic number.

1021917842 is a deficient number, since it is larger than the sum of its proper divisors (664135822).

1021917842 is an equidigital number, since it uses as much as digits as its factorization.

1021917842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383926 (or 383904 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1021917842 is about 31967.4497262450. The cubic root of 1021917842 is about 1007.2532110676.

The spelling of 1021917842 in words is "one billion, twenty-one million, nine hundred seventeen thousand, eight hundred forty-two".