220121550 has 216 divisors, whose sum is σ = 680918472. Its totient is φ = 52488000.

The previous prime is 220121549. The next prime is 220121563. The reversal of 220121550 is 55121022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3608520 + ... + 3608580.

Almost surely, 2^220121550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220121550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340459236).

220121550 is an abundant number, since it is smaller than the sum of its proper divisors (460796922).

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

220121550 is an equidigital number, since it uses as much as digits as its factorization.

220121550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 82 counting only the distinct ones).

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

The square root of 220121550 is about 14836.4938580515. The cubic root of 220121550 is about 603.7922311419.

Adding to 220121550 its reverse (55121022), we get a palindrome (275242572).

The spelling of 220121550 in words is "two hundred twenty million, one hundred twenty-one thousand, five hundred fifty".