20110021212 has 24 divisors (see below), whose sum is σ = 47265893136. Its totient is φ = 6654410368.

The previous prime is 20110021207. The next prime is 20110021213. The reversal of 20110021212 is 21212001102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110021213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6114543 + ... + 6117830.

It is an arithmetic number, because the mean of its divisors is an integer number (1969412214).

Almost surely, 2^20110021212 is an apocalyptic number.

It is an amenable number.

20110021212 is an abundant number, since it is smaller than the sum of its proper divisors (27155871924).

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

20110021212 is a wasteful number, since it uses less digits than its factorization.

20110021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12232517 (or 12232515 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20110021212 its reverse (21212001102), we get a palindrome (41322022314).

The spelling of 20110021212 in words is "twenty billion, one hundred ten million, twenty-one thousand, two hundred twelve".