221200210120021 has 32 divisors (see below), whose sum is σ = 244497554801280. Its totient is φ = 198456340992000.

The previous prime is 221200210119979. The next prime is 221200210120051. The reversal of 221200210120021 is 120021012002122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221200210120021 - 2⁹ = 221200210119509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221200210119977 and 221200210120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200210120051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154834045 + ... + 156256141.

It is an arithmetic number, because the mean of its divisors is an integer number (7640548587540).

Almost surely, 2^{221200210120021} is an apocalyptic number.

It is an amenable number.

221200210120021 is a deficient number, since it is larger than the sum of its proper divisors (23297344681259).

221200210120021 is a wasteful number, since it uses less digits than its factorization.

221200210120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422885.

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

Adding to 221200210120021 its reverse (120021012002122), we get a palindrome (341221222122143).

It can be divided in two parts, 22 and 1200210120021, that multiplied together give a palindrome (26404622640462).

The spelling of 221200210120021 in words is "two hundred twenty-one trillion, two hundred billion, two hundred ten million, one hundred twenty thousand, twenty-one".