21323434212 has 36 divisors (see below), whose sum is σ = 53905417020. Its totient is φ = 7107216192.

The previous prime is 21323434063. The next prime is 21323434213. The reversal of 21323434212 is 21243432312.

21323434212 is a `hidden beast` number, since 2 + 1 + 3 + 234 + 3 + 421 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4103171136 + 17220263076 = 64056^2 + 131226^2 .

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21323434213) 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, 706258 + ... + 735830.

It is an arithmetic number, because the mean of its divisors is an integer number (1497372695).

Almost surely, 2^21323434212 is an apocalyptic number.

It is an amenable number.

21323434212 is an abundant number, since it is smaller than the sum of its proper divisors (32581982808).

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

21323434212 is a wasteful number, since it uses less digits than its factorization.

21323434212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49612 (or 49607 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21323434212 its reverse (21243432312), we get a palindrome (42566866524).

It can be divided in two parts, 21323 and 434212, that added together give a triangular number (455535 = T₉₅₄).

The spelling of 21323434212 in words is "twenty-one billion, three hundred twenty-three million, four hundred thirty-four thousand, two hundred twelve".