1231221030 has 32 divisors (see below), whose sum is σ = 3182233824. Its totient is φ = 303069696.

The previous prime is 1231221029. The next prime is 1231221037. The reversal of 1231221030 is 301221321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221037) 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, 1578099 + ... + 1578878.

It is an arithmetic number, because the mean of its divisors is an integer number (99444807).

Almost surely, 2^1231221030 is an apocalyptic number.

1231221030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231221030 is an abundant number, since it is smaller than the sum of its proper divisors (1951012794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231221030 is a wasteful number, since it uses less digits than its factorization.

1231221030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157000.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231221030 is about 35088.7593112096. The cubic root of 1231221030 is about 1071.7956949659.

Adding to 1231221030 its reverse (301221321), we get a palindrome (1532442351).

The spelling of 1231221030 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, thirty".