1020002221 has 4 divisors (see below), whose sum is σ = 1165716832. Its totient is φ = 874287612.

The previous prime is 1020002219. The next prime is 1020002233. The reversal of 1020002221 is 1222000201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020002221 - 2¹ = 1020002219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020002198 and 1020002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020002201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72857295 + ... + 72857308.

It is an arithmetic number, because the mean of its divisors is an integer number (291429208).

Almost surely, 2^1020002221 is an apocalyptic number.

It is an amenable number.

1020002221 is a deficient number, since it is larger than the sum of its proper divisors (145714611).

1020002221 is an equidigital number, since it uses as much as digits as its factorization.

1020002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145714610.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1020002221 is about 31937.4736164275. The cubic root of 1020002221 is about 1006.6234401835.

Adding to 1020002221 its reverse (1222000201), we get a palindrome (2242002422).

The spelling of 1020002221 in words is "one billion, twenty million, two thousand, two hundred twenty-one".