1021123231 has 4 divisors (see below), whose sum is σ = 1031233464. Its totient is φ = 1011013000.

The previous prime is 1021123211. The next prime is 1021123333. The reversal of 1021123231 is 1323211201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021123231 is a prime.

It is a super-2 number, since 2×1021123231² = 2085385305775758722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021123211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5054965 + ... + 5055166.

It is an arithmetic number, because the mean of its divisors is an integer number (257808366).

Almost surely, 2^1021123231 is an apocalyptic number.

1021123231 is a deficient number, since it is larger than the sum of its proper divisors (10110233).

1021123231 is a wasteful number, since it uses less digits than its factorization.

1021123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10110232.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1021123231 is about 31955.0188702808. The cubic root of 1021123231 is about 1006.9920739564.

Adding to 1021123231 its reverse (1323211201), we get a palindrome (2344334432).

The spelling of 1021123231 in words is "one billion, twenty-one million, one hundred twenty-three thousand, two hundred thirty-one".