221211112001021 has 48 divisors (see below), whose sum is σ = 238078521233280. Its totient is φ = 205129532424960.

The previous prime is 221211112000997. The next prime is 221211112001027. The reversal of 221211112001021 is 120100211112122.

221211112001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-221211112001021 is a prime.

It is a super-4 number, since 4×221211112001021⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211112001027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2689096031 + ... + 2689178291.

It is an arithmetic number, because the mean of its divisors is an integer number (4959969192360).

Almost surely, 2^{221211112001021} is an apocalyptic number.

It is an amenable number.

221211112001021 is a deficient number, since it is larger than the sum of its proper divisors (16867409232259).

221211112001021 is a wasteful number, since it uses less digits than its factorization.

221211112001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82886 (or 82833 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221211112001021 its reverse (120100211112122), we get a palindrome (341311323113143).

The spelling of 221211112001021 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, one thousand, twenty-one".