21012120212222 has 16 divisors (see below), whose sum is σ = 31917490387200. Its totient is φ = 10372959631320.

The previous prime is 21012120212141. The next prime is 21012120212233. The reversal of 21012120212222 is 22221202121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012120212194 and 21012120212203.

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, 14991929 + ... + 16333467.

It is an arithmetic number, because the mean of its divisors is an integer number (1994843149200).

Almost surely, 2^{21012120212222} is an apocalyptic number.

21012120212222 is a deficient number, since it is larger than the sum of its proper divisors (10905370174978).

21012120212222 is a wasteful number, since it uses less digits than its factorization.

21012120212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440751.

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

Adding to 21012120212222 its reverse (22221202121012), we get a palindrome (43233322333234).

The spelling of 21012120212222 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-two".