1921201892279 has 8 divisors (see below), whose sum is σ = 1973293465200. Its totient is φ = 1869119119296.

The previous prime is 1921201892263. The next prime is 1921201892287. The reversal of 1921201892279 is 9722981021291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1921201892279 - 2⁴ = 1921201892263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921201892279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921201892179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1756229 + ... + 2631870.

It is an arithmetic number, because the mean of its divisors is an integer number (246661683150).

Almost surely, 2^{1921201892279} is an apocalyptic number.

1921201892279 is a deficient number, since it is larger than the sum of its proper divisors (52091572921).

1921201892279 is a wasteful number, since it uses less digits than its factorization.

1921201892279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399969.

The product of its (nonzero) digits is 653184, while the sum is 53.

The spelling of 1921201892279 in words is "one trillion, nine hundred twenty-one billion, two hundred one million, eight hundred ninety-two thousand, two hundred seventy-nine".