55264221 has 8 divisors (see below), whose sum is σ = 81872960. Its totient is φ = 36842796.

The previous prime is 55264211. The next prime is 55264241. The reversal of 55264221 is 12246255.

It is not a de Polignac number, because 55264221 - 2¹³ = 55256029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2046823 = 55264221 / (5 + 5 + 2 + 6 + 4 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55264201) 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, 1023385 + ... + 1023438.

It is an arithmetic number, because the mean of its divisors is an integer number (10234120).

Almost surely, 2^55264221 is an apocalyptic number.

It is an amenable number.

55264221 is a deficient number, since it is larger than the sum of its proper divisors (26608739).

55264221 is a wasteful number, since it uses less digits than its factorization.

55264221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046832 (or 2046826 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 55264221 is about 7433.9909200913. The cubic root of 55264221 is about 380.9032552429.

The spelling of 55264221 in words is "fifty-five million, two hundred sixty-four thousand, two hundred twenty-one".