20101212 has 36 divisors (see below), whose sum is σ = 52188136. Its totient is φ = 6518880.

The previous prime is 20101201. The next prime is 20101219. The reversal of 20101212 is 21210102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20101194 and 20101203.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6214 + ... + 8877.

Almost surely, 2^20101212 is an apocalyptic number.

It is an amenable number.

20101212 is an abundant number, since it is smaller than the sum of its proper divisors (32086924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20101212 is a wasteful number, since it uses less digits than its factorization.

20101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15138 (or 15133 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20101212 is about 4483.4375204747. The cubic root of 20101212 is about 271.8988774907.

Adding to 20101212 its reverse (21210102), we get a palindrome (41311314).

The spelling of 20101212 in words is "twenty million, one hundred one thousand, two hundred twelve".