20101211210101 has 16 divisors (see below), whose sum is σ = 24048217499904. Its totient is φ = 16427842763904.

The previous prime is 20101211210081. The next prime is 20101211210107. The reversal of 20101211210101 is 10101211210102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20101211210101 - 2²³ = 20101202821493 is a prime.

It is a super-2 number, since 2×20101211210101² (a number of 27 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 (20101211210107) 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, 199394086 + ... + 199494871.

It is an arithmetic number, because the mean of its divisors is an integer number (1503013593744).

Almost surely, 2^{20101211210101} is an apocalyptic number.

It is an amenable number.

20101211210101 is a deficient number, since it is larger than the sum of its proper divisors (3947006289803).

20101211210101 is a wasteful number, since it uses less digits than its factorization.

20101211210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398889300.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20101211210101 its reverse (10101211210102), we get a palindrome (30202422420203).

Subtracting from 20101211210101 its reverse (10101211210102), we obtain a palindrome (9999999999999).

The spelling of 20101211210101 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred ten thousand, one hundred one".