221001102212021 has 12 divisors (see below), whose sum is σ = 231576480025632. Its totient is φ = 210859752159000.

The previous prime is 221001102211979. The next prime is 221001102212057. The reversal of 221001102212021 is 120212201100122.

It is not a de Polignac number, because 221001102212021 - 2¹⁴ = 221001102195637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001102212081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1619438315 + ... + 1619574776.

It is an arithmetic number, because the mean of its divisors is an integer number (19298040002136).

Almost surely, 2^{221001102212021} is an apocalyptic number.

It is an amenable number.

221001102212021 is a deficient number, since it is larger than the sum of its proper divisors (10575377813611).

221001102212021 is an equidigital number, since it uses as much as digits as its factorization.

221001102212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239013224 (or 3239013193 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221001102212021 its reverse (120212201100122), we get a palindrome (341213303312143).

The spelling of 221001102212021 in words is "two hundred twenty-one trillion, one billion, one hundred two million, two hundred twelve thousand, twenty-one".