55221430 has 16 divisors (see below), whose sum is σ = 108435024. Its totient is φ = 20080480.

The previous prime is 55221407. The next prime is 55221433. The reversal of 55221430 is 3412255.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250897 + ... + 251116.

It is an arithmetic number, because the mean of its divisors is an integer number (6777189).

Almost surely, 2^55221430 is an apocalyptic number.

55221430 is a deficient number, since it is larger than the sum of its proper divisors (53213594).

55221430 is a wasteful number, since it uses less digits than its factorization.

55221430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502031.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55221430 is about 7431.1122989765. The cubic root of 55221430 is about 380.8049189261.

Adding to 55221430 its reverse (3412255), we get a palindrome (58633685).

The spelling of 55221430 in words is "fifty-five million, two hundred twenty-one thousand, four hundred thirty".