2121220024949 has 2 divisors, whose sum is σ = 2121220024950. Its totient is φ = 2121220024948.

The previous prime is 2121220024919. The next prime is 2121220024999. The reversal of 2121220024949 is 9494200221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1295938622449 + 825281402500 = 1138393^2 + 908450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121220024949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121220024919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060610012474 + 1060610012475.

It is an arithmetic number, because the mean of its divisors is an integer number (1060610012475).

Almost surely, 2^{2121220024949} is an apocalyptic number.

It is an amenable number.

2121220024949 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121220024949 is an equidigital number, since it uses as much as digits as its factorization.

2121220024949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 2121220024949 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, twenty-four thousand, nine hundred forty-nine".