21020002220122 has 24 divisors (see below), whose sum is σ = 32148063561600. Its totient is φ = 10307871203760.

The previous prime is 21020002220111. The next prime is 21020002220141. The reversal of 21020002220122 is 22102220002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020002220096 and 21020002220105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14469847 + ... + 15856117.

It is an arithmetic number, because the mean of its divisors is an integer number (1339502648400).

Almost surely, 2^{21020002220122} is an apocalyptic number.

21020002220122 is a deficient number, since it is larger than the sum of its proper divisors (11128061341478).

21020002220122 is a wasteful number, since it uses less digits than its factorization.

21020002220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389078 (or 1389025 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020002220122 its reverse (22102220002012), we get a palindrome (43122222222134).

The spelling of 21020002220122 in words is "twenty-one trillion, twenty billion, two million, two hundred twenty thousand, one hundred twenty-two".