12221021220021 has 12 divisors (see below), whose sum is σ = 18581669691520. Its totient is φ = 7718539717800.

The previous prime is 12221021220019. The next prime is 12221021220047. The reversal of 12221021220021 is 12002212012221.

It is a happy number.

12221021220021 is a `hidden beast` number, since 1 + 22 + 210 + 212 + 200 + 21 = 666.

It is not a de Polignac number, because 12221021220021 - 2¹ = 12221021220019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221021219976 and 12221021220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021227021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35733980005 + ... + 35733980346.

Almost surely, 2^{12221021220021} is an apocalyptic number.

It is an amenable number.

12221021220021 is a deficient number, since it is larger than the sum of its proper divisors (6360648471499).

12221021220021 is a wasteful number, since it uses less digits than its factorization.

12221021220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71467960376 (or 71467960373 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12221021220021 its reverse (12002212012221), we get a palindrome (24223233232242).

The spelling of 12221021220021 in words is "twelve trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty thousand, twenty-one".