52121220 has 96 divisors (see below), whose sum is σ = 153861120. Its totient is φ = 13157760.

The previous prime is 52121219. The next prime is 52121221. The reversal of 52121220 is 2212125.

It is an interprime number because it is at equal distance from previous prime (52121219) and next prime (52121221).

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

It is a self number, because there is not a number n which added to its sum of digits gives 52121220.

It is not an unprimeable number, because it can be changed into a prime (52121221) 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, 246915 + ... + 247125.

It is an arithmetic number, because the mean of its divisors is an integer number (1602720).

Almost surely, 2^52121220 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 52121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76930560).

52121220 is an abundant number, since it is smaller than the sum of its proper divisors (101739900).

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

52121220 is a wasteful number, since it uses less digits than its factorization.

52121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 52121220 is about 7219.5027529602. The cubic root of 52121220 is about 373.5409258588.

Adding to 52121220 its reverse (2212125), we get a palindrome (54333345).

The spelling of 52121220 in words is "fifty-two million, one hundred twenty-one thousand, two hundred twenty".