1020123211 has 4 divisors (see below), whose sum is σ = 1020571552. Its totient is φ = 1019674872.

The previous prime is 1020123197. The next prime is 1020123217. The reversal of 1020123211 is 1123210201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020123211 - 2¹⁷ = 1019992139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020123191 and 1020123200.

It is not an unprimeable number, because it can be changed into a prime (1020123217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220740 + ... + 225313.

It is an arithmetic number, because the mean of its divisors is an integer number (255142888).

Almost surely, 2^1020123211 is an apocalyptic number.

1020123211 is a deficient number, since it is larger than the sum of its proper divisors (448341).

1020123211 is an equidigital number, since it uses as much as digits as its factorization.

1020123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448340.

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

The square root of 1020123211 is about 31939.3677301226. The cubic root of 1020123211 is about 1006.6632396245.

Adding to 1020123211 its reverse (1123210201), we get a palindrome (2143333412).

The spelling of 1020123211 in words is "one billion, twenty million, one hundred twenty-three thousand, two hundred eleven".