212021202121 has 8 divisors (see below), whose sum is σ = 212917428360. Its totient is φ = 211126556928.

The previous prime is 212021202101. The next prime is 212021202137. The reversal of 212021202121 is 121202120212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17726259600 + 194294942521 = 133140^2 + 440789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212021202121 - 2¹⁷ = 212021071049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021202095 and 212021202104.

It is not an unprimeable number, because it can be changed into a prime (212021202101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126106 + ... + 663283.

It is an arithmetic number, because the mean of its divisors is an integer number (26614678545).

Almost surely, 2^212021202121 is an apocalyptic number.

It is an amenable number.

212021202121 is a deficient number, since it is larger than the sum of its proper divisors (896226239).

212021202121 is an equidigital number, since it uses as much as digits as its factorization.

212021202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790523.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212021202121 its reverse (121202120212), we get a palindrome (333223322333).

The spelling of 212021202121 in words is "two hundred twelve billion, twenty-one million, two hundred two thousand, one hundred twenty-one".