1621341321 has 8 divisors (see below), whose sum is σ = 2163889344. Its totient is φ = 1079843760.

The previous prime is 1621341313. The next prime is 1621341329. The reversal of 1621341321 is 1231431261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1621341313) and next prime (1621341329).

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

It is not a de Polignac number, because 1621341321 - 2³ = 1621341313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621341291 and 1621341300.

It is not an unprimeable number, because it can be changed into a prime (1621341329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259006 + ... + 265191.

It is an arithmetic number, because the mean of its divisors is an integer number (270486168).

Almost surely, 2^1621341321 is an apocalyptic number.

It is an amenable number.

1621341321 is a deficient number, since it is larger than the sum of its proper divisors (542548023).

1621341321 is a wasteful number, since it uses less digits than its factorization.

1621341321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525231.

The product of its digits is 864, while the sum is 24.

The square root of 1621341321 is about 40265.8828414329. The cubic root of 1621341321 is about 1174.7843445473.

Adding to 1621341321 its reverse (1231431261), we get a palindrome (2852772582).

The spelling of 1621341321 in words is "one billion, six hundred twenty-one million, three hundred forty-one thousand, three hundred twenty-one".