21012120001222 has 16 divisors (see below), whose sum is σ = 36028521994752. Its totient is φ = 9003258073800.

The previous prime is 21012120001199. The next prime is 21012120001261. The reversal of 21012120001222 is 22210002121012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012120001196 and 21012120001205.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 161283598 + ... + 161413825.

It is an arithmetic number, because the mean of its divisors is an integer number (2251782624672).

Almost surely, 2^{21012120001222} is an apocalyptic number.

21012120001222 is a deficient number, since it is larger than the sum of its proper divisors (15016401993530).

21012120001222 is a wasteful number, since it uses less digits than its factorization.

21012120001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322702083.

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

Adding to 21012120001222 its reverse (22210002121012), we get a palindrome (43222122122234).

The spelling of 21012120001222 in words is "twenty-one trillion, twelve billion, one hundred twenty million, one thousand, two hundred twenty-two".