212111202021 has 16 divisors (see below), whose sum is σ = 287646707520. Its totient is φ = 138992220800.

The previous prime is 212111202001. The next prime is 212111202041. The reversal of 212111202021 is 120202111212.

It is an interprime number because it is at equal distance from previous prime (212111202001) and next prime (212111202041).

It is a cyclic number.

It is not a de Polignac number, because 212111202021 - 2⁶ = 212111201957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1322641 + ... + 1474313.

It is an arithmetic number, because the mean of its divisors is an integer number (17977919220).

Almost surely, 2^212111202021 is an apocalyptic number.

It is an amenable number.

212111202021 is a deficient number, since it is larger than the sum of its proper divisors (75535505499).

212111202021 is a wasteful number, since it uses less digits than its factorization.

212111202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159636.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212111202021 its reverse (120202111212), we get a palindrome (332313313233).

The spelling of 212111202021 in words is "two hundred twelve billion, one hundred eleven million, two hundred two thousand, twenty-one".