4021211111021 has 12 divisors (see below), whose sum is σ = 4438734038676. Its totient is φ = 3621353326080.

The previous prime is 4021211110999. The next prime is 4021211111039. The reversal of 4021211111021 is 1201111121204.

4021211111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 2996399082121 + 1024812028900 = 1731011^2 + 1012330^2 .

It is not a de Polignac number, because 4021211111021 - 2⁶ = 4021211110957 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 (4021211111221) 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, 91984076 + ... + 92027781.

It is an arithmetic number, because the mean of its divisors is an integer number (369894503223).

Almost surely, 2^{4021211111021} is an apocalyptic number.

4021211111021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4021211111021 is a deficient number, since it is larger than the sum of its proper divisors (417522927655).

4021211111021 is a wasteful number, since it uses less digits than its factorization.

4021211111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184011952 (or 184011911 counting only the distinct ones).

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

Adding to 4021211111021 its reverse (1201111121204), we get a palindrome (5222322232225).

The spelling of 4021211111021 in words is "four trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, twenty-one".