1022002021 has 8 divisors (see below), whose sum is σ = 1077193080. Its totient is φ = 968140992.

The previous prime is 1022001989. The next prime is 1022002031. The reversal of 1022002021 is 1202002201.

It can be written as a sum of positive squares in 4 ways, for example, as 108451396 + 913550625 = 10414^2 + 30225^2 .

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 1022002021 - 2⁵ = 1022001989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022001989 and 1022002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022002031) 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, 330930 + ... + 334003.

It is an arithmetic number, because the mean of its divisors is an integer number (134649135).

Almost surely, 2^1022002021 is an apocalyptic number.

It is an amenable number.

1022002021 is a deficient number, since it is larger than the sum of its proper divisors (55191059).

1022002021 is an equidigital number, since it uses as much as digits as its factorization.

1022002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665015.

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

The square root of 1022002021 is about 31968.7663352842. The cubic root of 1022002021 is about 1007.2808673157.

Adding to 1022002021 its reverse (1202002201), we get a palindrome (2224004222).

The spelling of 1022002021 in words is "one billion, twenty-two million, two thousand, twenty-one".