1922121387 has 16 divisors (see below), whose sum is σ = 2881898880. Its totient is φ = 1265974056.

The previous prime is 1922121379. The next prime is 1922121449. The reversal of 1922121387 is 7831212291.

It is not a de Polignac number, because 1922121387 - 2³ = 1922121379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1922121787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426613 + ... + 431094.

It is an arithmetic number, because the mean of its divisors is an integer number (180118680).

Almost surely, 2^1922121387 is an apocalyptic number.

1922121387 is a deficient number, since it is larger than the sum of its proper divisors (959777493).

1922121387 is an equidigital number, since it uses as much as digits as its factorization.

1922121387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857799 (or 857793 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 1922121387 is about 43842.0048241410. The cubic root of 1922121387 is about 1243.3505868576.

The spelling of 1922121387 in words is "one billion, nine hundred twenty-two million, one hundred twenty-one thousand, three hundred eighty-seven".