1023205221 has 6 divisors (see below), whose sum is σ = 1477963110. Its totient is φ = 682136808.

The previous prime is 1023205217. The next prime is 1023205229. The reversal of 1023205221 is 1225023201.

It can be written as a sum of positive squares in only one way, i.e., 734681025 + 288524196 = 27105^2 + 16986^2 .

It is not a de Polignac number, because 1023205221 - 2² = 1023205217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1023205194 and 1023205203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023205229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56844726 + ... + 56844743.

It is an arithmetic number, because the mean of its divisors is an integer number (246327185).

Almost surely, 2^1023205221 is an apocalyptic number.

It is an amenable number.

1023205221 is a deficient number, since it is larger than the sum of its proper divisors (454757889).

1023205221 is a wasteful number, since it uses less digits than its factorization.

1023205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113689475 (or 113689472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1023205221 is about 31987.5791675456. The cubic root of 1023205221 is about 1007.6760019022.

Adding to 1023205221 its reverse (1225023201), we get a palindrome (2248228422).

The spelling of 1023205221 in words is "one billion, twenty-three million, two hundred five thousand, two hundred twenty-one".