1020021223 has 4 divisors (see below), whose sum is σ = 1098484408. Its totient is φ = 941558040.

The previous prime is 1020021209. The next prime is 1020021229. The reversal of 1020021223 is 3221200201.

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

It is a cyclic number.

It is not a de Polignac number, because 1020021223 - 2¹³ = 1020013031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 78463171 = 1020021223 / (1 + 0 + 2 + 0 + 0 + 2 + 1 + 2 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39231573 + ... + 39231598.

It is an arithmetic number, because the mean of its divisors is an integer number (274621102).

Almost surely, 2^1020021223 is an apocalyptic number.

1020021223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1020021223 is a deficient number, since it is larger than the sum of its proper divisors (78463185).

1020021223 is an equidigital number, since it uses as much as digits as its factorization.

1020021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78463184.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1020021223 is about 31937.7711025676. The cubic root of 1020021223 is about 1006.6296910652.

Adding to 1020021223 its reverse (3221200201), we get a palindrome (4241221424).

The spelling of 1020021223 in words is "one billion, twenty million, twenty-one thousand, two hundred twenty-three".