55221447 has 16 divisors (see below), whose sum is σ = 76769280. Its totient is φ = 35268000.

The previous prime is 55221433. The next prime is 55221461. The reversal of 55221447 is 74412255.

It is an interprime number because it is at equal distance from previous prime (55221433) and next prime (55221461).

It is not a de Polignac number, because 55221447 - 2⁷ = 55221319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55221407) 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, 6454 + ... + 12332.

It is an arithmetic number, because the mean of its divisors is an integer number (4798080).

Almost surely, 2^55221447 is an apocalyptic number.

55221447 is a deficient number, since it is larger than the sum of its proper divisors (21547833).

55221447 is a wasteful number, since it uses less digits than its factorization.

55221447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014.

The product of its digits is 11200, while the sum is 30.

The square root of 55221447 is about 7431.1134428160. The cubic root of 55221447 is about 380.8049580032.

The spelling of 55221447 in words is "fifty-five million, two hundred twenty-one thousand, four hundred forty-seven".