55221899 has 4 divisors (see below), whose sum is σ = 58470264. Its totient is φ = 51973536.

The previous prime is 55221893. The next prime is 55221911. The reversal of 55221899 is 99812255.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55221899 - 2¹² = 55217803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55221893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624157 + ... + 1624190.

It is an arithmetic number, because the mean of its divisors is an integer number (14617566).

Almost surely, 2^55221899 is an apocalyptic number.

55221899 is a deficient number, since it is larger than the sum of its proper divisors (3248365).

55221899 is a wasteful number, since it uses less digits than its factorization.

55221899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3248364.

The product of its digits is 64800, while the sum is 41.

The square root of 55221899 is about 7431.1438554236. The cubic root of 55221899 is about 380.8059969919.

The spelling of 55221899 in words is "fifty-five million, two hundred twenty-one thousand, eight hundred ninety-nine".