231621030 has 48 divisors (see below), whose sum is σ = 605118384. Its totient is φ = 61467840.

The previous prime is 231620989. The next prime is 231621053. The reversal of 231621030 is 30126132.

231621030 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231620994 and 231621012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12892 + ... + 25088.

It is an arithmetic number, because the mean of its divisors is an integer number (12606633).

Almost surely, 2^231621030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231621030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302559192).

231621030 is an abundant number, since it is smaller than the sum of its proper divisors (373497354).

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

231621030 is a wasteful number, since it uses less digits than its factorization.

231621030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12421 (or 12418 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231621030 is about 15219.1008275785. The cubic root of 231621030 is about 614.1286092607.

Adding to 231621030 its reverse (30126132), we get a palindrome (261747162).

The spelling of 231621030 in words is "two hundred thirty-one million, six hundred twenty-one thousand, thirty".