1011021231 has 16 divisors (see below), whose sum is σ = 1474956288. Its totient is φ = 610915200.

The previous prime is 1011021199. The next prime is 1011021233. The reversal of 1011021231 is 1321201101.

It is not a de Polignac number, because 1011021231 - 2⁵ = 1011021199 is a prime.

It is a super-2 number, since 2×1011021231² = 2044327859065510722, which contains 22 as substring.

1011021231 is a modest number, since divided by 21231 gives 1011 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011021233) 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, 34335 + ... + 56576.

It is an arithmetic number, because the mean of its divisors is an integer number (92184768).

Almost surely, 2^1011021231 is an apocalyptic number.

1011021231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011021231 is a deficient number, since it is larger than the sum of its proper divisors (463935057).

1011021231 is a wasteful number, since it uses less digits than its factorization.

1011021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91262.

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

The square root of 1011021231 is about 31796.5600497915. The cubic root of 1011021231 is about 1003.6603293090.

Adding to 1011021231 its reverse (1321201101), we get a palindrome (2332222332).

The spelling of 1011021231 in words is "one billion, eleven million, twenty-one thousand, two hundred thirty-one".