5551421220 has 216 divisors, whose sum is σ = 17757577656. Its totient is φ = 1403652096.

The previous prime is 5551421209. The next prime is 5551421231. The reversal of 5551421220 is 221241555.

It is an interprime number because it is at equal distance from previous prime (5551421209) and next prime (5551421231).

It can be written as a sum of positive squares in 4 ways, for example, as 1016206884 + 4535214336 = 31878^2 + 67344^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16472892 + ... + 16473228.

Almost surely, 2^5551421220 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 5551421220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8878788828).

5551421220 is an abundant number, since it is smaller than the sum of its proper divisors (12206156436).

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

5551421220 is a wasteful number, since it uses less digits than its factorization.

5551421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 5551421220 is about 74507.8601222717. The cubic root of 5551421220 is about 1770.6581675663.

Adding to 5551421220 its reverse (221241555), we get a palindrome (5772662775).

The spelling of 5551421220 in words is "five billion, five hundred fifty-one million, four hundred twenty-one thousand, two hundred twenty".