2001212102101 has 4 divisors (see below), whose sum is σ = 2001579909804. Its totient is φ = 2000844294400.

The previous prime is 2001212102077. The next prime is 2001212102137. The reversal of 2001212102101 is 1012012121002.

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 608788502001 + 1392423600100 = 780249^2 + 1180010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001212102101 - 2²¹ = 2001210004949 is a prime.

It is a super-2 number, since 2×2001212102101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212102171) 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, 183895690 + ... + 183906571.

It is an arithmetic number, because the mean of its divisors is an integer number (500394977451).

Almost surely, 2^{2001212102101} is an apocalyptic number.

It is an amenable number.

2001212102101 is a deficient number, since it is larger than the sum of its proper divisors (367807703).

2001212102101 is an equidigital number, since it uses as much as digits as its factorization.

2001212102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367807702.

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

Adding to 2001212102101 its reverse (1012012121002), we get a palindrome (3013224223103).

The spelling of 2001212102101 in words is "two trillion, one billion, two hundred twelve million, one hundred two thousand, one hundred one".