21020111222002 has 16 divisors (see below), whose sum is σ = 33404555503800. Its totient is φ = 9885988016128.

The previous prime is 21020111221961. The next prime is 21020111222027. The reversal of 21020111222002 is 20022211102012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18680799092641 + 2339312129361 = 4322129^2 + 1529481^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182098627 + ... + 182214022.

Almost surely, 2^{21020111222002} is an apocalyptic number.

21020111222002 is a deficient number, since it is larger than the sum of its proper divisors (12384444281798).

21020111222002 is a wasteful number, since it uses less digits than its factorization.

21020111222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364314365.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020111222002 its reverse (20022211102012), we get a palindrome (41042322324014).

The spelling of 21020111222002 in words is "twenty-one trillion, twenty billion, one hundred eleven million, two hundred twenty-two thousand, two".