1021113123 has 16 divisors (see below), whose sum is σ = 1424664576. Its totient is φ = 649753920.

The previous prime is 1021113101. The next prime is 1021113151. The reversal of 1021113123 is 3213111201.

It is a happy number.

It is not a de Polignac number, because 1021113123 - 2¹² = 1021109027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021113173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68415 + ... + 81992.

It is an arithmetic number, because the mean of its divisors is an integer number (89041536).

Almost surely, 2^1021113123 is an apocalyptic number.

1021113123 is a deficient number, since it is larger than the sum of its proper divisors (403551453).

1021113123 is a wasteful number, since it uses less digits than its factorization.

1021113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150514.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1021113123 is about 31954.8607100704. The cubic root of 1021113123 is about 1006.9887512397.

Adding to 1021113123 its reverse (3213111201), we get a palindrome (4234224324).

The spelling of 1021113123 in words is "one billion, twenty-one million, one hundred thirteen thousand, one hundred twenty-three".