1231232021 has 8 divisors (see below), whose sum is σ = 1360338624. Its totient is φ = 1108423360.

The previous prime is 1231232003. The next prime is 1231232059. The reversal of 1231232021 is 1202321321.

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

It is not a de Polignac number, because 1231232021 - 2²⁶ = 1164123157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231232621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1574075 + ... + 1574856.

It is an arithmetic number, because the mean of its divisors is an integer number (170042328).

Almost surely, 2^1231232021 is an apocalyptic number.

It is an amenable number.

1231232021 is a deficient number, since it is larger than the sum of its proper divisors (129106603).

1231232021 is a wasteful number, since it uses less digits than its factorization.

1231232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148971.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231232021 is about 35088.9159279679. The cubic root of 1231232021 is about 1071.7988842311.

Adding to 1231232021 its reverse (1202321321), we get a palindrome (2433553342).

The spelling of 1231232021 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, twenty-one".