212021102202021 has 36 divisors (see below), whose sum is σ = 356344330709952. Its totient is φ = 121123904855184.

The previous prime is 212021102201999. The next prime is 212021102202043. The reversal of 212021102202021 is 120202201120212.

It is a happy number.

212021102202021 is a `hidden beast` number, since 212 + 0 + 21 + 10 + 220 + 202 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (212021102201999) and next prime (212021102202043).

It is not a de Polignac number, because 212021102202021 - 2¹⁷ = 212021102070949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212021102201985 and 212021102202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021102206021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 59804205 + ... + 63250178.

It is an arithmetic number, because the mean of its divisors is an integer number (9898453630832).

Almost surely, 2^{212021102202021} is an apocalyptic number.

212021102202021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212021102202021 is a deficient number, since it is larger than the sum of its proper divisors (144323228507931).

212021102202021 is a wasteful number, since it uses less digits than its factorization.

212021102202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123058310 (or 123058300 counting only the distinct ones).

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

Adding to 212021102202021 its reverse (120202201120212), we get a palindrome (332223303322233).

The spelling of 212021102202021 in words is "two hundred twelve trillion, twenty-one billion, one hundred two million, two hundred two thousand, twenty-one".