1098200921 has 2 divisors, whose sum is σ = 1098200922. Its totient is φ = 1098200920.

The previous prime is 1098200881. The next prime is 1098200963. The reversal of 1098200921 is 1290028901.

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., 1096603225 + 1597696 = 33115^2 + 1264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098200921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1098200981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549100460 + 549100461.

It is an arithmetic number, because the mean of its divisors is an integer number (549100461).

Almost surely, 2^1098200921 is an apocalyptic number.

It is an amenable number.

1098200921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098200921 is an equidigital number, since it uses as much as digits as its factorization.

1098200921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1098200921 is about 33139.1146683191. The cubic root of 1098200921 is about 1031.7170345857.

The spelling of 1098200921 in words is "one billion, ninety-eight million, two hundred thousand, nine hundred twenty-one".