20101211 has 4 divisors (see below), whose sum is σ = 21647472. Its totient is φ = 18554952.

The previous prime is 20101201. The next prime is 20101219. The reversal of 20101211 is 11210102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11210102 = 2 ⋅5605051.

It is not a de Polignac number, because 20101211 - 2²² = 15906907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773111 + ... + 773136.

It is an arithmetic number, because the mean of its divisors is an integer number (5411868).

Almost surely, 2^20101211 is an apocalyptic number.

20101211 is a deficient number, since it is larger than the sum of its proper divisors (1546261).

20101211 is a wasteful number, since it uses less digits than its factorization.

20101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546260.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20101211 is about 4483.4374089531. The cubic root of 20101211 is about 271.8988729819.

Adding to 20101211 its reverse (11210102), we get a palindrome (31311313).

The spelling of 20101211 in words is "twenty million, one hundred one thousand, two hundred eleven".