2121021212953 has 2 divisors, whose sum is σ = 2121021212954. Its totient is φ = 2121021212952.

The previous prime is 2121021212867. The next prime is 2121021213023. The reversal of 2121021212953 is 3592121201212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091289443904 + 1029731769049 = 1044648^2 + 1014757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121021212953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121021312953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510606476 + 1060510606477.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510606477).

Almost surely, 2^{2121021212953} is an apocalyptic number.

It is an amenable number.

2121021212953 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121021212953 is an equidigital number, since it uses as much as digits as its factorization.

2121021212953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 2121021212953 in words is "two trillion, one hundred twenty-one billion, twenty-one million, two hundred twelve thousand, nine hundred fifty-three".