21021120212 has 24 divisors (see below), whose sum is σ = 39972253440. Its totient is φ = 9636166080.

The previous prime is 21021120151. The next prime is 21021120229. The reversal of 21021120212 is 21202112012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4458833 + ... + 4463544.

It is an arithmetic number, because the mean of its divisors is an integer number (1665510560).

Almost surely, 2^21021120212 is an apocalyptic number.

It is an amenable number.

21021120212 is a deficient number, since it is larger than the sum of its proper divisors (18951133228).

21021120212 is a wasteful number, since it uses less digits than its factorization.

21021120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8922431 (or 8922429 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021120212 its reverse (21202112012), we get a palindrome (42223232224).

The spelling of 21021120212 in words is "twenty-one billion, twenty-one million, one hundred twenty thousand, two hundred twelve".