1929221321 has 2 divisors, whose sum is σ = 1929221322. Its totient is φ = 1929221320.

The previous prime is 1929221311. The next prime is 1929221341. The reversal of 1929221321 is 1231229291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1702387600 + 226833721 = 41260^2 + 15061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1929221321 - 2²² = 1925027017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1929221311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964610660 + 964610661.

It is an arithmetic number, because the mean of its divisors is an integer number (964610661).

Almost surely, 2^1929221321 is an apocalyptic number.

It is an amenable number.

1929221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1929221321 is an equidigital number, since it uses as much as digits as its factorization.

1929221321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1929221321 is about 43922.9020102270. The cubic root of 1929221321 is about 1244.8796023420.

The spelling of 1929221321 in words is "one billion, nine hundred twenty-nine million, two hundred twenty-one thousand, three hundred twenty-one".