1921801201 has 8 divisors (see below), whose sum is σ = 1974916544. Its totient is φ = 1868747760.

The previous prime is 1921801181. The next prime is 1921801223. The reversal of 1921801201 is 1021081291.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1921801201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921808201) 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 7 ways as a sum of consecutive naturals, for example, 51406 + ... + 80536.

It is an arithmetic number, because the mean of its divisors is an integer number (246864568).

Almost surely, 2^1921801201 is an apocalyptic number.

It is an amenable number.

1921801201 is a deficient number, since it is larger than the sum of its proper divisors (53115343).

1921801201 is a wasteful number, since it uses less digits than its factorization.

1921801201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30951.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1921801201 is about 43838.3530826604. The cubic root of 1921801201 is about 1243.2815441216.

Adding to 1921801201 its reverse (1021081291), we get a palindrome (2942882492).

The spelling of 1921801201 in words is "one billion, nine hundred twenty-one million, eight hundred one thousand, two hundred one".