1921322001 has 16 divisors (see below), whose sum is σ = 2623921344. Its totient is φ = 1249860864.

The previous prime is 1921321981. The next prime is 1921322021. The reversal of 1921322001 is 1002231291.

It is an interprime number because it is at equal distance from previous prime (1921321981) and next prime (1921322021).

It is not a de Polignac number, because 1921322001 - 2⁷ = 1921321873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1921322021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134725 + ... + 148301.

It is an arithmetic number, because the mean of its divisors is an integer number (163995084).

Almost surely, 2^1921322001 is an apocalyptic number.

It is an amenable number.

1921322001 is a deficient number, since it is larger than the sum of its proper divisors (702599343).

1921322001 is a wasteful number, since it uses less digits than its factorization.

1921322001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14720.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1921322001 is about 43832.8872081226. The cubic root of 1921322001 is about 1243.1781983573.

Adding to 1921322001 its reverse (1002231291), we get a palindrome (2923553292).

It can be divided in two parts, 19213 and 22001, that added together give a palindrome (41214).

The spelling of 1921322001 in words is "one billion, nine hundred twenty-one million, three hundred twenty-two thousand, one".