21121020212222 has 16 divisors (see below), whose sum is σ = 36527883252192. Its totient is φ = 8971760797440.

The previous prime is 21121020212213. The next prime is 21121020212251. The reversal of 21121020212222 is 22221202012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121020212194 and 21121020212203.

It is a congruent number.

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, 6675415679 + ... + 6675418842.

It is an arithmetic number, because the mean of its divisors is an integer number (2282992703262).

Almost surely, 2^{21121020212222} is an apocalyptic number.

21121020212222 is a deficient number, since it is larger than the sum of its proper divisors (15406863039970).

21121020212222 is a wasteful number, since it uses less digits than its factorization.

21121020212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13350834643.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21121020212222 its reverse (22221202012112), we get a palindrome (43342222224334).

The spelling of 21121020212222 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred twenty-two".