21210021011212 has 24 divisors (see below), whose sum is σ = 40673436152832. Its totient is φ = 9597685818000.

The previous prime is 21210021011197. The next prime is 21210021011279. The reversal of 21210021011212 is 21211012001212.

It is a super-2 number, since 2×21210021011212² (a number of 27 digits) contains 22 as substring.

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, 1080810664 + ... + 1080830287.

It is an arithmetic number, because the mean of its divisors is an integer number (1694726506368).

Almost surely, 2^{21210021011212} is an apocalyptic number.

21210021011212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21210021011212 is a deficient number, since it is larger than the sum of its proper divisors (19463415141620).

21210021011212 is a wasteful number, since it uses less digits than its factorization.

21210021011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161641189 (or 2161641187 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210021011212 its reverse (21211012001212), we get a palindrome (42421033012424).

The spelling of 21210021011212 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, eleven thousand, two hundred twelve".