21222210000121 has 16 divisors (see below), whose sum is σ = 24057730468800. Its totient is φ = 18558566883648.

The previous prime is 21222210000077. The next prime is 21222210000133. The reversal of 21222210000121 is 12100001222212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21222210000121 - 2⁷ = 21222209999993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222210000095 and 21222210000104.

It is not an unprimeable number, because it can be changed into a prime (21222210000151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67805175 + ... + 68117443.

It is an arithmetic number, because the mean of its divisors is an integer number (1503608154300).

Almost surely, 2^{21222210000121} is an apocalyptic number.

It is an amenable number.

21222210000121 is a deficient number, since it is larger than the sum of its proper divisors (2835520468679).

21222210000121 is a wasteful number, since it uses less digits than its factorization.

21222210000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587448.

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

Adding to 21222210000121 its reverse (12100001222212), we get a palindrome (33322211222333).

The spelling of 21222210000121 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, one hundred twenty-one", and thus it is an aban number.