221913725 has 24 divisors (see below), whose sum is σ = 300986688. Its totient is φ = 160963200.

The previous prime is 221913721. The next prime is 221913761. The reversal of 221913725 is 527319122.

It is not a de Polignac number, because 221913725 - 2² = 221913721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221913691 and 221913700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221913721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133097 + ... + 134753.

It is an arithmetic number, because the mean of its divisors is an integer number (12541112).

Almost surely, 2^221913725 is an apocalyptic number.

221913725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221913725 is a deficient number, since it is larger than the sum of its proper divisors (79072963).

221913725 is a wasteful number, since it uses less digits than its factorization.

221913725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165 (or 2160 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 221913725 is about 14896.7689449760. The cubic root of 221913725 is about 605.4264461473.

The spelling of 221913725 in words is "two hundred twenty-one million, nine hundred thirteen thousand, seven hundred twenty-five".