221389797 has 8 divisors (see below), whose sum is σ = 295296480. Its totient is φ = 147538160.

The previous prime is 221389783. The next prime is 221389807. The reversal of 221389797 is 797983122.

221389797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221389797 - 2⁶ = 221389733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221389747) 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, 3222 + ... + 21287.

It is an arithmetic number, because the mean of its divisors is an integer number (36912060).

Almost surely, 2^221389797 is an apocalyptic number.

It is an amenable number.

221389797 is a deficient number, since it is larger than the sum of its proper divisors (73906683).

221389797 is a wasteful number, since it uses less digits than its factorization.

221389797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27523.

The product of its digits is 381024, while the sum is 48.

The square root of 221389797 is about 14879.1732633235. The cubic root of 221389797 is about 604.9496094451.

The spelling of 221389797 in words is "two hundred twenty-one million, three hundred eighty-nine thousand, seven hundred ninety-seven".