1021011231 has 8 divisors (see below), whose sum is σ = 1362685744. Its totient is φ = 680005440.

The previous prime is 1021011217. The next prime is 1021011241. The reversal of 1021011231 is 1321101201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1021011231 is a prime.

It is a super-2 number, since 2×1021011231² = 2084927867656270722, which contains 22 as substring.

It is a Duffinian number.

1021011231 is a modest number, since divided by 11231 gives 1021 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021011241) 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 7 ways as a sum of consecutive naturals, for example, 163606 + ... + 169731.

It is an arithmetic number, because the mean of its divisors is an integer number (170335718).

Almost surely, 2^1021011231 is an apocalyptic number.

1021011231 is a deficient number, since it is larger than the sum of its proper divisors (341674513).

1021011231 is a wasteful number, since it uses less digits than its factorization.

1021011231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334361.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1021011231 is about 31953.2663588560. The cubic root of 1021011231 is about 1006.9552559268.

Adding to 1021011231 its reverse (1321101201), we get a palindrome (2342112432).

The spelling of 1021011231 in words is "one billion, twenty-one million, eleven thousand, two hundred thirty-one".