221013425 has 12 divisors (see below), whose sum is σ = 274440396. Its totient is φ = 176563200.

The previous prime is 221013409. The next prime is 221013451. The reversal of 221013425 is 524310122.

221013425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 68046001 + 152967424 = 8249^2 + 12368^2 .

It is not a de Polignac number, because 221013425 - 2⁴ = 221013409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221013397 and 221013406.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13217 + ... + 24833.

It is an arithmetic number, because the mean of its divisors is an integer number (22870033).

Almost surely, 2^221013425 is an apocalyptic number.

221013425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221013425 is a deficient number, since it is larger than the sum of its proper divisors (53426971).

221013425 is a wasteful number, since it uses less digits than its factorization.

221013425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12388 (or 12383 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 221013425 is about 14866.5202720744. The cubic root of 221013425 is about 604.6066017052.

Adding to 221013425 its reverse (524310122), we get a palindrome (745323547).

The spelling of 221013425 in words is "two hundred twenty-one million, thirteen thousand, four hundred twenty-five".