21210011212 has 24 divisors (see below), whose sum is σ = 39991271600. Its totient is φ = 9784691136.

The previous prime is 21210011153. The next prime is 21210011279. The reversal of 21210011212 is 21211001212.

It is a super-2 number, since 2×21210011212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21210011192 and 21210011201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19714 + ... + 206902.

Almost surely, 2^21210011212 is an apocalyptic number.

It is an amenable number.

21210011212 is a deficient number, since it is larger than the sum of its proper divisors (18781260388).

21210011212 is a wasteful number, since it uses less digits than its factorization.

21210011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189385 (or 189383 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210011212 its reverse (21211001212), we get a palindrome (42421012424).

The spelling of 21210011212 in words is "twenty-one billion, two hundred ten million, eleven thousand, two hundred twelve".