52211220 has 48 divisors (see below), whose sum is σ = 147715008. Its totient is φ = 13777920.

The previous prime is 52211177. The next prime is 52211251. The reversal of 52211220 is 2211225.

It is a super-2 number, since 2×52211220² = 5452022987776800, which contains 22 as substring.

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 52211220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1335 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (3077396).

Almost surely, 2^52211220 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 52211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73857504).

52211220 is an abundant number, since it is smaller than the sum of its proper divisors (95503788).

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

52211220 is a wasteful number, since it uses less digits than its factorization.

52211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9080 (or 9078 counting only the distinct ones).

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

The square root of 52211220 is about 7225.7331807921. The cubic root of 52211220 is about 373.7558054004.

Adding to 52211220 its reverse (2211225), we get a palindrome (54422445).

It can be divided in two parts, 5221 and 1220, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 52211220 in words is "fifty-two million, two hundred eleven thousand, two hundred twenty".