221200010021 has 8 divisors (see below), whose sum is σ = 221652077184. Its totient is φ = 220748265360.

The previous prime is 221200009993. The next prime is 221200010027. The reversal of 221200010021 is 120010002122.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221200009984 and 221200010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200010027) 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, 1317200 + ... + 1475606.

It is an arithmetic number, because the mean of its divisors is an integer number (27706509648).

Almost surely, 2^221200010021 is an apocalyptic number.

It is an amenable number.

221200010021 is a deficient number, since it is larger than the sum of its proper divisors (452067163).

221200010021 is a wasteful number, since it uses less digits than its factorization.

221200010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161251.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221200010021 its reverse (120010002122), we get a palindrome (341210012143).

The spelling of 221200010021 in words is "two hundred twenty-one billion, two hundred million, ten thousand, twenty-one".