2121222989 has 2 divisors, whose sum is σ = 2121222990. Its totient is φ = 2121222988.

The previous prime is 2121222979. The next prime is 2121222997. The reversal of 2121222989 is 9892221212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2119865764 + 1357225 = 46042^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121222989 - 2⁴ = 2121222973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121222919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611494 + 1060611495.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611495).

Almost surely, 2^2121222989 is an apocalyptic number.

It is an amenable number.

2121222989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222989 is an equidigital number, since it uses as much as digits as its factorization.

2121222989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 2121222989 is about 46056.7366299437. The cubic root of 2121222989 is about 1284.8786370163.

The spelling of 2121222989 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, nine hundred eighty-nine".