2198671021 has 2 divisors, whose sum is σ = 2198671022. Its totient is φ = 2198671020.

The previous prime is 2198670997. The next prime is 2198671031. The reversal of 2198671021 is 1201768912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2096357796 + 102313225 = 45786^2 + 10115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198671021 - 2¹⁷ = 2198539949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2198671031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099335510 + 1099335511.

It is an arithmetic number, because the mean of its divisors is an integer number (1099335511).

Almost surely, 2^2198671021 is an apocalyptic number.

It is an amenable number.

2198671021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198671021 is an equidigital number, since it uses as much as digits as its factorization.

2198671021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 2198671021 is about 46889.9884943471. The cubic root of 2198671021 is about 1300.3295064149.

The spelling of 2198671021 in words is "two billion, one hundred ninety-eight million, six hundred seventy-one thousand, twenty-one".