221025849 has 32 divisors (see below), whose sum is σ = 336147840. Its totient is φ = 127948800.

The previous prime is 221025829. The next prime is 221025887. The reversal of 221025849 is 948520122.

221025849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221025849 - 2¹² = 221021753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (221025809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91639 + ... + 94019.

It is an arithmetic number, because the mean of its divisors is an integer number (10504620).

Almost surely, 2^221025849 is an apocalyptic number.

221025849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

221025849 is a deficient number, since it is larger than the sum of its proper divisors (115121991).

221025849 is a wasteful number, since it uses less digits than its factorization.

221025849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 221025849 is about 14866.9381178506. The cubic root of 221025849 is about 604.6179305671.

The spelling of 221025849 in words is "two hundred twenty-one million, twenty-five thousand, eight hundred forty-nine".