1021231231 has 4 divisors (see below), whose sum is σ = 1022560000. Its totient is φ = 1019902464.

The previous prime is 1021231217. The next prime is 1021231273. The reversal of 1021231231 is 1321321201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321321201 = 167 ⋅7912103.

It is a cyclic number.

It is not a de Polignac number, because 1021231231 - 2⁷ = 1021231103 is a prime.

It is a super-2 number, since 2×1021231231² = 2085826454339550722, 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 (1021232231) 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, 663231 + ... + 664768.

It is an arithmetic number, because the mean of its divisors is an integer number (255640000).

Almost surely, 2^1021231231 is an apocalyptic number.

1021231231 is a deficient number, since it is larger than the sum of its proper divisors (1328769).

1021231231 is an equidigital number, since it uses as much as digits as its factorization.

1021231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328768.

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

The square root of 1021231231 is about 31956.7087009911. The cubic root of 1021231231 is about 1007.0275745067.

Adding to 1021231231 its reverse (1321321201), we get a palindrome (2342552432).

The spelling of 1021231231 in words is "one billion, twenty-one million, two hundred thirty-one thousand, two hundred thirty-one".