221026822 has 4 divisors (see below), whose sum is σ = 331540236. Its totient is φ = 110513410.

The previous prime is 221026747. The next prime is 221026823. The reversal of 221026822 is 228620122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221026823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55256704 + ... + 55256707.

It is an arithmetic number, because the mean of its divisors is an integer number (82885059).

Almost surely, 2^221026822 is an apocalyptic number.

221026822 is a deficient number, since it is larger than the sum of its proper divisors (110513414).

221026822 is a wasteful number, since it uses less digits than its factorization.

221026822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110513413.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 221026822 is about 14866.9708414324. The cubic root of 221026822 is about 604.6188177821.

Adding to 221026822 its reverse (228620122), we get a palindrome (449646944).

The spelling of 221026822 in words is "two hundred twenty-one million, twenty-six thousand, eight hundred twenty-two".