190921158842 has 4 divisors (see below), whose sum is σ = 286381738266. Its totient is φ = 95460579420.

The previous prime is 190921158821. The next prime is 190921158847. The reversal of 190921158842 is 248851129091.

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

It can be written as a sum of positive squares in only one way, i.e., 148171874761 + 42749284081 = 384931^2 + 206759^2 .

It is not an unprimeable number, because it can be changed into a prime (190921158847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47730289709 + ... + 47730289712.

Almost surely, 2^190921158842 is an apocalyptic number.

190921158842 is a deficient number, since it is larger than the sum of its proper divisors (95460579424).

190921158842 is an equidigital number, since it uses as much as digits as its factorization.

190921158842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95460579423.

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 190921158842 in words is "one hundred ninety billion, nine hundred twenty-one million, one hundred fifty-eight thousand, eight hundred forty-two".