1921120143 has 4 divisors (see below), whose sum is σ = 2561493528. Its totient is φ = 1280746760.

The previous prime is 1921120141. The next prime is 1921120151. The reversal of 1921120143 is 3410211291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3410211291 = 3 ⋅1136737097.

It is a cyclic number.

It is not a de Polignac number, because 1921120143 - 2¹ = 1921120141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921120141) 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, 320186688 + ... + 320186693.

It is an arithmetic number, because the mean of its divisors is an integer number (640373382).

Almost surely, 2^1921120143 is an apocalyptic number.

1921120143 is a deficient number, since it is larger than the sum of its proper divisors (640373385).

1921120143 is an equidigital number, since it uses as much as digits as its factorization.

1921120143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640373384.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1921120143 is about 43830.5845614680. The cubic root of 1921120143 is about 1243.1346598886.

The spelling of 1921120143 in words is "one billion, nine hundred twenty-one million, one hundred twenty thousand, one hundred forty-three".