1002210021 has 12 divisors (see below), whose sum is σ = 1449896448. Its totient is φ = 667097064.

The previous prime is 1002210017. The next prime is 1002210023. The reversal of 1002210021 is 1200122001.

It is not a de Polignac number, because 1002210021 - 2² = 1002210017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1002209985 and 1002210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002210023) 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 11 ways as a sum of consecutive naturals, for example, 80805 + ... + 92378.

It is an arithmetic number, because the mean of its divisors is an integer number (120824704).

Almost surely, 2^1002210021 is an apocalyptic number.

It is an amenable number.

1002210021 is a deficient number, since it is larger than the sum of its proper divisors (447686427).

1002210021 is a wasteful number, since it uses less digits than its factorization.

1002210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173832 (or 173829 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1002210021 is about 31657.7008167049. The cubic root of 1002210021 is about 1000.7361316439.

Adding to 1002210021 its reverse (1200122001), we get a palindrome (2202332022).

The spelling of 1002210021 in words is "one billion, two million, two hundred ten thousand, twenty-one".