10550221220 has 48 divisors (see below), whose sum is σ = 27622401408. Its totient is φ = 3288380160.

The previous prime is 10550221189. The next prime is 10550221223. The reversal of 10550221220 is 2212205501.

It is a happy number.

It is a super-2 number, since 2×10550221220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 10550221192 and 10550221201.

It is not an unprimeable number, because it can be changed into a prime (10550221223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3423857 + ... + 3426936.

It is an arithmetic number, because the mean of its divisors is an integer number (575466696).

Almost surely, 2^10550221220 is an apocalyptic number.

10550221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10550221220 is an abundant number, since it is smaller than the sum of its proper divisors (17072180188).

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

10550221220 is a wasteful number, since it uses less digits than its factorization.

10550221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850820 (or 6850818 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 10550221220 its reverse (2212205501), we get a palindrome (12762426721).

The spelling of 10550221220 in words is "ten billion, five hundred fifty million, two hundred twenty-one thousand, two hundred twenty".