21023012212 has 12 divisors (see below), whose sum is σ = 36791324640. Its totient is φ = 10511205176.

The previous prime is 21023012177. The next prime is 21023012221. The reversal of 21023012212 is 21221032012.

It is a happy number.

It is a super-2 number, since 2×21023012212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 172839 + ... + 268177.

It is an arithmetic number, because the mean of its divisors is an integer number (3065943720).

Almost surely, 2^21023012212 is an apocalyptic number.

It is an amenable number.

21023012212 is a deficient number, since it is larger than the sum of its proper divisors (15768312428).

21023012212 is a wasteful number, since it uses less digits than its factorization.

21023012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150470 (or 150468 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21023012212 its reverse (21221032012), we get a palindrome (42244044224).

The spelling of 21023012212 in words is "twenty-one billion, twenty-three million, twelve thousand, two hundred twelve".