1021210121123 has 2 divisors, whose sum is σ = 1021210121124. Its totient is φ = 1021210121122.

The previous prime is 1021210121111. The next prime is 1021210121209. The reversal of 1021210121123 is 3211210121201.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3211210121201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021210121123 - 2²⁰ = 1021209072547 is a prime.

It is a super-2 number, since 2×1021210121123² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021210127123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510605060561 + 510605060562.

It is an arithmetic number, because the mean of its divisors is an integer number (510605060562).

Almost surely, 2^{1021210121123} is an apocalyptic number.

1021210121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021210121123 is an equidigital number, since it uses as much as digits as its factorization.

1021210121123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1021210121123 its reverse (3211210121201), we get a palindrome (4232420242324).

The spelling of 1021210121123 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-three".