21210003212 has 24 divisors (see below), whose sum is σ = 38355945600. Its totient is φ = 10251895680.

The previous prime is 21210003211. The next prime is 21210003223. The reversal of 21210003212 is 21230001212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21210003211) 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, 24914 + ... + 207462.

It is an arithmetic number, because the mean of its divisors is an integer number (1598164400).

Almost surely, 2^21210003212 is an apocalyptic number.

It is an amenable number.

21210003212 is a deficient number, since it is larger than the sum of its proper divisors (17145942388).

21210003212 is a wasteful number, since it uses less digits than its factorization.

21210003212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183521 (or 183519 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210003212 its reverse (21230001212), we get a palindrome (42440004424).

It can be divided in two parts, 2121000 and 3212, that added together give a palindrome (2124212).

The spelling of 21210003212 in words is "twenty-one billion, two hundred ten million, three thousand, two hundred twelve".