1940220921 has 8 divisors (see below), whose sum is σ = 2591268064. Its totient is φ = 1291327200.

The previous prime is 1940220859. The next prime is 1940220949. The reversal of 1940220921 is 1290220491.

It is a happy number.

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

It is not a de Polignac number, because 1940220921 - 2¹⁸ = 1939958777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940220521) 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, 536251 + ... + 539856.

It is an arithmetic number, because the mean of its divisors is an integer number (323908508).

Almost surely, 2^1940220921 is an apocalyptic number.

It is an amenable number.

1940220921 is a deficient number, since it is larger than the sum of its proper divisors (651047143).

1940220921 is a wasteful number, since it uses less digits than its factorization.

1940220921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076711.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1940220921 is about 44047.9388961618. The cubic root of 1940220921 is about 1247.2410448266.

The spelling of 1940220921 in words is "one billion, nine hundred forty million, two hundred twenty thousand, nine hundred twenty-one".