21021100220122 has 16 divisors (see below), whose sum is σ = 33386622809472. Its totient is φ = 9892232228800.

The previous prime is 21021100220117. The next prime is 21021100220149. The reversal of 21021100220122 is 22102200112012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021100220096 and 21021100220105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5715093 + ... + 8643175.

It is an arithmetic number, because the mean of its divisors is an integer number (2086663925592).

Almost surely, 2^{21021100220122} is an apocalyptic number.

21021100220122 is a deficient number, since it is larger than the sum of its proper divisors (12365522589350).

21021100220122 is a wasteful number, since it uses less digits than its factorization.

21021100220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139253.

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

Adding to 21021100220122 its reverse (22102200112012), we get a palindrome (43123300332134).

The spelling of 21021100220122 in words is "twenty-one trillion, twenty-one billion, one hundred million, two hundred twenty thousand, one hundred twenty-two".