2152121123 has 2 divisors, whose sum is σ = 2152121124. Its totient is φ = 2152121122.

The previous prime is 2152121113. The next prime is 2152121129. The reversal of 2152121123 is 3211212512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2152121123 - 2⁴ = 2152121107 is a prime.

It is a super-2 number, since 2×2152121123² = 9263250656125562258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 2152121095 and 2152121104.

It is not a weakly prime, because it can be changed into another prime (2152121129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076060561 + 1076060562.

It is an arithmetic number, because the mean of its divisors is an integer number (1076060562).

Almost surely, 2^2152121123 is an apocalyptic number.

2152121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2152121123 is an equidigital number, since it uses as much as digits as its factorization.

2152121123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 2152121123 is about 46390.9594964364. The cubic root of 2152121123 is about 1291.0871837623.

Adding to 2152121123 its reverse (3211212512), we get a palindrome (5363333635).

The spelling of 2152121123 in words is "two billion, one hundred fifty-two million, one hundred twenty-one thousand, one hundred twenty-three".