1021513123 has 2 divisors, whose sum is σ = 1021513124. Its totient is φ = 1021513122.

The previous prime is 1021513027. The next prime is 1021513133. The reversal of 1021513123 is 3213151201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021513123 is a prime.

It is a super-2 number, since 2×1021513123² = 2086978120922426258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021513123.

It is not a weakly prime, because it can be changed into another prime (1021513133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510756561 + 510756562.

It is an arithmetic number, because the mean of its divisors is an integer number (510756562).

Almost surely, 2^1021513123 is an apocalyptic number.

1021513123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021513123 is an equidigital number, since it uses as much as digits as its factorization.

1021513123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1021513123 is about 31961.1189259700. The cubic root of 1021513123 is about 1007.1202230970.

Adding to 1021513123 its reverse (3213151201), we get a palindrome (4234664324).

The spelling of 1021513123 in words is "one billion, twenty-one million, five hundred thirteen thousand, one hundred twenty-three".