213121024 has 48 divisors (see below), whose sum is σ = 448648200. Its totient is φ = 100933632.

The previous prime is 213121021. The next prime is 213121057. The reversal of 213121024 is 420121312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 213120989 and 213121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121021) 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, 36174 + ... + 41650.

Almost surely, 2^213121024 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213121024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224324100).

213121024 is an abundant number, since it is smaller than the sum of its proper divisors (235527176).

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

213121024 is an equidigital number, since it uses as much as digits as its factorization.

213121024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518 (or 5498 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 213121024 is about 14598.6651444576. The cubic root of 213121024 is about 597.3223495713.

Adding to 213121024 its reverse (420121312), we get a palindrome (633242336).

The spelling of 213121024 in words is "two hundred thirteen million, one hundred twenty-one thousand, twenty-four".