2001212222101 has 4 divisors (see below), whose sum is σ = 2065767455104. Its totient is φ = 1936656989100.

The previous prime is 2001212222099. The next prime is 2001212222131. The reversal of 2001212222101 is 1012222121002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2001212222101 - 2¹ = 2001212222099 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 (2001212222131) 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, 32277616455 + ... + 32277616516.

It is an arithmetic number, because the mean of its divisors is an integer number (516441863776).

Almost surely, 2^{2001212222101} is an apocalyptic number.

It is an amenable number.

2001212222101 is a deficient number, since it is larger than the sum of its proper divisors (64555233003).

2001212222101 is an equidigital number, since it uses as much as digits as its factorization.

2001212222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64555233002.

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

Adding to 2001212222101 its reverse (1012222121002), we get a palindrome (3013434343103).

The spelling of 2001212222101 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred one".