20211212 has 24 divisors (see below), whose sum is σ = 42551040. Its totient is φ = 8205840.

The previous prime is 20211209. The next prime is 20211221. The reversal of 20211212 is 21211202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20211193 and 20211202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18464 + ... + 19527.

It is an arithmetic number, because the mean of its divisors is an integer number (1772960).

Almost surely, 2^20211212 is an apocalyptic number.

It is an amenable number.

20211212 is an abundant number, since it is smaller than the sum of its proper divisors (22339828).

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

20211212 is a wasteful number, since it uses less digits than its factorization.

20211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38021 (or 38019 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 20211212 is about 4495.6881564450. The cubic root of 20211212 is about 272.3939468914.

Adding to 20211212 its reverse (21211202), we get a palindrome (41422414).

The spelling of 20211212 in words is "twenty million, two hundred eleven thousand, two hundred twelve".