221001221011021 has 32 divisors (see below), whose sum is σ = 244824704340480. Its totient is φ = 197831517844800.

The previous prime is 221001221010989. The next prime is 221001221011091. The reversal of 221001221011021 is 120110122100122.

It is a cyclic number.

It is not a de Polignac number, because 221001221011021 - 2⁵ = 221001221010989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001221010986 and 221001221011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001221011091) 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, 80495310 + ... + 83195536.

It is an arithmetic number, because the mean of its divisors is an integer number (7650772010640).

Almost surely, 2^{221001221011021} is an apocalyptic number.

It is an amenable number.

221001221011021 is a deficient number, since it is larger than the sum of its proper divisors (23823483329459).

221001221011021 is a wasteful number, since it uses less digits than its factorization.

221001221011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700825.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221001221011021 its reverse (120110122100122), we get a palindrome (341111343111143).

The spelling of 221001221011021 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, eleven thousand, twenty-one".