321221099 has 4 divisors (see below), whose sum is σ = 322442736. Its totient is φ = 319999464.

The previous prime is 321221083. The next prime is 321221113. The reversal of 321221099 is 990122123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 990122123 = 1657 ⋅597539.

It is not a de Polignac number, because 321221099 - 2⁴ = 321221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610424 + ... + 610949.

It is an arithmetic number, because the mean of its divisors is an integer number (80610684).

Almost surely, 2^321221099 is an apocalyptic number.

321221099 is a deficient number, since it is larger than the sum of its proper divisors (1221637).

321221099 is a wasteful number, since it uses less digits than its factorization.

321221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221636.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 321221099 is about 17922.6420764350. The cubic root of 321221099 is about 684.8592951627.

The spelling of 321221099 in words is "three hundred twenty-one million, two hundred twenty-one thousand, ninety-nine".