53121030 has 64 divisors (see below), whose sum is σ = 134120448. Its totient is φ = 13439360.

The previous prime is 53121001. The next prime is 53121031. The reversal of 53121030 is 3012135.

It is a happy number.

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 (53121031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115000 + ... + 115460.

It is an arithmetic number, because the mean of its divisors is an integer number (2095632).

Almost surely, 2^53121030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53121030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67060224).

53121030 is an abundant number, since it is smaller than the sum of its proper divisors (80999418).

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

53121030 is a wasteful number, since it uses less digits than its factorization.

53121030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 53121030 is about 7288.4175237153. The cubic root of 53121030 is about 375.9142846336.

Adding to 53121030 its reverse (3012135), we get a palindrome (56133165).

The spelling of 53121030 in words is "fifty-three million, one hundred twenty-one thousand, thirty".