221212002001021 has 16 divisors (see below), whose sum is σ = 232222735756800. Its totient is φ = 210443589662400.

The previous prime is 221212002000989. The next prime is 221212002001027. The reversal of 221212002001021 is 120100200212122.

It is a happy number.

221212002001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221212002001021 - 2⁵ = 221212002000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221212002000986 and 221212002001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212002001027) 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, 94072791 + ... + 96395611.

It is an arithmetic number, because the mean of its divisors is an integer number (14513920984800).

Almost surely, 2^{221212002001021} is an apocalyptic number.

It is an amenable number.

221212002001021 is a deficient number, since it is larger than the sum of its proper divisors (11010733755779).

221212002001021 is a wasteful number, since it uses less digits than its factorization.

221212002001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374980.

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

Adding to 221212002001021 its reverse (120100200212122), we get a palindrome (341312202213143).

The spelling of 221212002001021 in words is "two hundred twenty-one trillion, two hundred twelve billion, two million, one thousand, twenty-one".