1000021231 has 4 divisors (see below), whose sum is σ = 1090932264. Its totient is φ = 909110200.

The previous prime is 1000021229. The next prime is 1000021247. The reversal of 1000021231 is 1321200001.

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 1000021231 - 2¹ = 1000021229 is a prime.

It is a super-2 number, since 2×1000021231² = 2000084924901510722, 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 (1000021261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45455500 + ... + 45455521.

It is an arithmetic number, because the mean of its divisors is an integer number (272733066).

Almost surely, 2^1000021231 is an apocalyptic number.

1000021231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1000021231 is a deficient number, since it is larger than the sum of its proper divisors (90911033).

1000021231 is an equidigital number, since it uses as much as digits as its factorization.

1000021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90911032.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1000021231 is about 31623.1122914871. The cubic root of 1000021231 is about 1000.0070769499.

Adding to 1000021231 its reverse (1321200001), we get a palindrome (2321221232).

The spelling of 1000021231 in words is "one billion, twenty-one thousand, two hundred thirty-one".