2021212221021 has 12 divisors (see below), whose sum is σ = 3336604301472. Its totient is φ = 1154978411976.

The previous prime is 2021212221019. The next prime is 2021212221023. The reversal of 2021212221021 is 1201222121202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021212221019) and next prime (2021212221023).

It is not a de Polignac number, because 2021212221021 - 2¹ = 2021212221019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021212220985 and 2021212221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021212221023) 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, 16041366771 + ... + 16041366896.

It is an arithmetic number, because the mean of its divisors is an integer number (278050358456).

Almost surely, 2^{2021212221021} is an apocalyptic number.

2021212221021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2021212221021 is a deficient number, since it is larger than the sum of its proper divisors (1315392080451).

2021212221021 is a wasteful number, since it uses less digits than its factorization.

2021212221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32082733680 (or 32082733677 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021212221021 its reverse (1201222121202), we get a palindrome (3222434342223).

The spelling of 2021212221021 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".