2198578321 has 3 divisors (see below), whose sum is σ = 2198625211. Its totient is φ = 2198531432.

The previous prime is 2198578307. The next prime is 2198578337. The reversal of 2198578321 is 1238758912.

It is a happy number.

The square root of 2198578321 is 46889.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1096338321 + 1102240000 = 33111^2 + 33200^2 .

It is not a de Polignac number, because 2198578321 - 2²⁷ = 2064360593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2198578021) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 23445 + ... + 70333.

Almost surely, 2^2198578321 is an apocalyptic number.

2198578321 is the 46889-th square number.

2198578321 is the 23445-th centered octagonal number.

It is an amenable number.

2198578321 is a deficient number, since it is larger than the sum of its proper divisors (46890).

2198578321 is an frugal number, since it uses more digits than its factorization.

2198578321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93778 (or 46889 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The cubic root of 2198578321 is about 1300.3112313997.

The spelling of 2198578321 in words is "two billion, one hundred ninety-eight million, five hundred seventy-eight thousand, three hundred twenty-one".