2121229949 has 2 divisors, whose sum is σ = 2121229950. Its totient is φ = 2121229948.

The previous prime is 2121229931. The next prime is 2121229967. The reversal of 2121229949 is 9499221212.

It is a balanced prime because it is at equal distance from previous prime (2121229931) and next prime (2121229967).

It can be written as a sum of positive squares in only one way, i.e., 2109105625 + 12124324 = 45925^2 + 3482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121229949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121229249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060614974 + 1060614975.

It is an arithmetic number, because the mean of its divisors is an integer number (1060614975).

Almost surely, 2^2121229949 is an apocalyptic number.

It is an amenable number.

2121229949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121229949 is an equidigital number, since it uses as much as digits as its factorization.

2121229949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 2121229949 is about 46056.8121888608. The cubic root of 2121229949 is about 1284.8800422977.

The spelling of 2121229949 in words is "two billion, one hundred twenty-one million, two hundred twenty-nine thousand, nine hundred forty-nine".