20001212210101 has 16 divisors (see below), whose sum is σ = 21114995440000. Its totient is φ = 18893591490816.

The previous prime is 20001212210093. The next prime is 20001212210137. The reversal of 20001212210101 is 10101221210002.

It is a cyclic number.

It is not a de Polignac number, because 20001212210101 - 2³ = 20001212210093 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 (20001212210141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12675505 + ... + 14165833.

It is an arithmetic number, because the mean of its divisors is an integer number (1319687215000).

Almost surely, 2^{20001212210101} is an apocalyptic number.

It is an amenable number.

20001212210101 is a deficient number, since it is larger than the sum of its proper divisors (1113783229899).

20001212210101 is a wasteful number, since it uses less digits than its factorization.

20001212210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492396.

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

Adding to 20001212210101 its reverse (10101221210002), we get a palindrome (30102433420103).

The spelling of 20001212210101 in words is "twenty trillion, one billion, two hundred twelve million, two hundred ten thousand, one hundred one".