2195986421 has 2 divisors, whose sum is σ = 2195986422. Its totient is φ = 2195986420.

The previous prime is 2195986369. The next prime is 2195986469. The reversal of 2195986421 is 1246895912.

It is a happy number.

2195986421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2096266225 + 99720196 = 45785^2 + 9986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2195986421 - 2¹⁴ = 2195970037 is a prime.

It is a super-2 number, since 2×2195986421² = 9644712722432778482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195986021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097993210 + 1097993211.

It is an arithmetic number, because the mean of its divisors is an integer number (1097993211).

Almost surely, 2^2195986421 is an apocalyptic number.

It is an amenable number.

2195986421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195986421 is an equidigital number, since it uses as much as digits as its factorization.

2195986421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 47.

The square root of 2195986421 is about 46861.3531708166. The cubic root of 2195986421 is about 1299.8000522859.

The spelling of 2195986421 in words is "two billion, one hundred ninety-five million, nine hundred eighty-six thousand, four hundred twenty-one".