21022220002 has 24 divisors (see below), whose sum is σ = 37946517660. Its totient is φ = 8698848480.

The previous prime is 21022219909. The next prime is 21022220017. The reversal of 21022220002 is 20002222012.

It can be written as a sum of positive squares in 2 ways, for example, as 19527547081 + 1494672921 = 139741^2 + 38661^2 .

It is an unprimeable number.

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, 3695649 + ... + 3701332.

Almost surely, 2^21022220002 is an apocalyptic number.

21022220002 is a deficient number, since it is larger than the sum of its proper divisors (16924297658).

21022220002 is a wasteful number, since it uses less digits than its factorization.

21022220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397026 (or 7397019 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21022220002 its reverse (20002222012), we get a palindrome (41024442014).

The spelling of 21022220002 in words is "twenty-one billion, twenty-two million, two hundred twenty thousand, two".