221021202212021 has 8 divisors (see below), whose sum is σ = 221103350973120. Its totient is φ = 220939060187808.

The previous prime is 221021202211829. The next prime is 221021202212029. The reversal of 221021202212021 is 120212202120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221021202212021 - 2³⁸ = 220746324305077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021202211984 and 221021202212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021202212029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64424945 + ... + 67768841.

It is an arithmetic number, because the mean of its divisors is an integer number (27637918871640).

Almost surely, 2^{221021202212021} is an apocalyptic number.

It is an amenable number.

221021202212021 is a deficient number, since it is larger than the sum of its proper divisors (82148761099).

221021202212021 is a wasteful number, since it uses less digits than its factorization.

221021202212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368443.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221021202212021 its reverse (120212202120122), we get a palindrome (341233404332143).

The spelling of 221021202212021 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred two million, two hundred twelve thousand, twenty-one".