1922209921 has 4 divisors (see below), whose sum is σ = 1923700144. Its totient is φ = 1920719700.

The previous prime is 1922209867. The next prime is 1922209931. The reversal of 1922209921 is 1299022291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1922209921 - 2²⁹ = 1385339009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1922209931) 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, 743175 + ... + 745756.

It is an arithmetic number, because the mean of its divisors is an integer number (480925036).

Almost surely, 2^1922209921 is an apocalyptic number.

It is an amenable number.

1922209921 is a deficient number, since it is larger than the sum of its proper divisors (1490223).

1922209921 is a wasteful number, since it uses less digits than its factorization.

1922209921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490222.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1922209921 is about 43843.0145063042. The cubic root of 1922209921 is about 1243.3696763753.

The spelling of 1922209921 in words is "one billion, nine hundred twenty-two million, two hundred nine thousand, nine hundred twenty-one".