2197850021 has 2 divisors, whose sum is σ = 2197850022. Its totient is φ = 2197850020.

The previous prime is 2197850009. The next prime is 2197850033. The reversal of 2197850021 is 1200587912.

It is a balanced prime because it is at equal distance from previous prime (2197850009) and next prime (2197850033).

It can be written as a sum of positive squares in only one way, i.e., 2194922500 + 2927521 = 46850^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197850021 - 2⁶ = 2197849957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2197850041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098925010 + 1098925011.

It is an arithmetic number, because the mean of its divisors is an integer number (1098925011).

Almost surely, 2^2197850021 is an apocalyptic number.

It is an amenable number.

2197850021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197850021 is an equidigital number, since it uses as much as digits as its factorization.

2197850021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 2197850021 is about 46881.2331429112. The cubic root of 2197850021 is about 1300.1676353844.

The spelling of 2197850021 in words is "two billion, one hundred ninety-seven million, eight hundred fifty thousand, twenty-one".