1021012123 has 2 divisors, whose sum is σ = 1021012124. Its totient is φ = 1021012122.

The previous prime is 1021012121. The next prime is 1021012127. The reversal of 1021012123 is 3212101201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021012123 - 2¹ = 1021012121 is a prime.

Together with 1021012121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1021012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510506061 + 510506062.

It is an arithmetic number, because the mean of its divisors is an integer number (510506062).

Almost surely, 2^1021012123 is an apocalyptic number.

1021012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021012123 is an equidigital number, since it uses as much as digits as its factorization.

1021012123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021012123 is about 31953.2803167374. The cubic root of 1021012123 is about 1006.9555491667.

Adding to 1021012123 its reverse (3212101201), we get a palindrome (4233113324).

The spelling of 1021012123 in words is "one billion, twenty-one million, twelve thousand, one hundred twenty-three".