52121520 has 120 divisors (see below), whose sum is σ = 190983312. Its totient is φ = 12633600.

The previous prime is 52121479. The next prime is 52121521. The reversal of 52121520 is 2512125.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×52121520² = 5433305694220800, which contains 22 as substring.

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 = 52121493 and 52121502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52121521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4630 + ... + 11210.

Almost surely, 2^52121520 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 52121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95491656).

52121520 is an abundant number, since it is smaller than the sum of its proper divisors (138861792).

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

52121520 is a wasteful number, since it uses less digits than its factorization.

52121520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611 (or 6602 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 52121520 is about 7219.5235299845. The cubic root of 52121520 is about 373.5416425347.

Adding to 52121520 its reverse (2512125), we get a palindrome (54633645).

The spelling of 52121520 in words is "fifty-two million, one hundred twenty-one thousand, five hundred twenty".