212021012101 has 4 divisors (see below), whose sum is σ = 212269572172. Its totient is φ = 211772452032.

The previous prime is 212021012089. The next prime is 212021012153. The reversal of 212021012101 is 101210120212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117237075201 + 94783936900 = 342399^2 + 307870^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021012101 - 2²¹ = 212018914949 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 (212021012701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124278756 + ... + 124280461.

It is an arithmetic number, because the mean of its divisors is an integer number (53067393043).

Almost surely, 2^212021012101 is an apocalyptic number.

It is an amenable number.

212021012101 is a deficient number, since it is larger than the sum of its proper divisors (248560071).

212021012101 is an equidigital number, since it uses as much as digits as its factorization.

212021012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248560070.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212021012101 its reverse (101210120212), we get a palindrome (313231132313).

The spelling of 212021012101 in words is "two hundred twelve billion, twenty-one million, twelve thousand, one hundred one".