21012021011212 has 48 divisors (see below), whose sum is σ = 45844763747328. Its totient is φ = 8186438430720.

The previous prime is 21012021011131. The next prime is 21012021011213. The reversal of 21012021011212 is 21211012021012.

It is a super-2 number, since 2×21012021011212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012021011213) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 70104333 + ... + 70403419.

It is an arithmetic number, because the mean of its divisors is an integer number (955099244736).

Almost surely, 2^{21012021011212} is an apocalyptic number.

21012021011212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012021011212 is an abundant number, since it is smaller than the sum of its proper divisors (24832742736116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012021011212 is a wasteful number, since it uses less digits than its factorization.

21012021011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527206 (or 527204 counting only the distinct ones).

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

Adding to 21012021011212 its reverse (21211012021012), we get a palindrome (42223033032224).

The spelling of 21012021011212 in words is "twenty-one trillion, twelve billion, twenty-one million, eleven thousand, two hundred twelve".