221201000201021 has 8 divisors (see below), whose sum is σ = 221299736810040. Its totient is φ = 221102264845312.

The previous prime is 221201000200991. The next prime is 221201000201039. The reversal of 221201000201021 is 120102000102122.

It can be written as a sum of positive squares in 4 ways, for example, as 52460614420900 + 168740385780121 = 7242970^2 + 12990011^2 .

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-221201000201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201000200987 and 221201000201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201000201221) 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, 681940151 + ... + 682264443.

It is an arithmetic number, because the mean of its divisors is an integer number (27662467101255).

Almost surely, 2^{221201000201021} is an apocalyptic number.

It is an amenable number.

221201000201021 is a deficient number, since it is larger than the sum of its proper divisors (98736609019).

221201000201021 is a wasteful number, since it uses less digits than its factorization.

221201000201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626655.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221201000201021 its reverse (120102000102122), we get a palindrome (341303000303143).

The spelling of 221201000201021 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred one thousand, twenty-one".