21200000212 has 24 divisors (see below), whose sum is σ = 40023536616. Its totient is φ = 9788233728.

The previous prime is 21200000141. The next prime is 21200000219.

21200000212 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 10965440656 + 10234559556 = 104716^2 + 101166^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200000219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2937573 + ... + 2944780.

It is an arithmetic number, because the mean of its divisors is an integer number (1667647359).

Almost surely, 2^21200000212 is an apocalyptic number.

It is an amenable number.

21200000212 is a deficient number, since it is larger than the sum of its proper divisors (18823536404).

21200000212 is a wasteful number, since it uses less digits than its factorization.

21200000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5882427 (or 5882425 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

It can be divided in two parts, 21200000 and 212, that added together give a palindrome (21200212).

The spelling of 21200000212 in words is "twenty-one billion, two hundred million, two hundred twelve", and thus it is an aban number.