2196722621 has 2 divisors, whose sum is σ = 2196722622. Its totient is φ = 2196722620.

The previous prime is 2196722611. The next prime is 2196722659. The reversal of 2196722621 is 1262276912.

It is an a-pointer prime, because the next prime (2196722659) can be obtained adding 2196722621 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1919666596 + 277056025 = 43814^2 + 16645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2196722621 is a prime.

It is a super-2 number, since 2×2196722621² = 9651180547226219282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2196722611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098361310 + 1098361311.

It is an arithmetic number, because the mean of its divisors is an integer number (1098361311).

Almost surely, 2^2196722621 is an apocalyptic number.

It is an amenable number.

2196722621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2196722621 is an equidigital number, since it uses as much as digits as its factorization.

2196722621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 2196722621 is about 46869.2075994464. The cubic root of 2196722621 is about 1299.9452878355.

The spelling of 2196722621 in words is "two billion, one hundred ninety-six million, seven hundred twenty-two thousand, six hundred twenty-one".