21212210020012 has 24 divisors (see below), whose sum is σ = 40503674195712. Its totient is φ = 9640095339600.

The previous prime is 21212210019991. The next prime is 21212210020019. The reversal of 21212210020012 is 21002001221212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21212210020019) 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, 45221664 + ... + 45688327.

It is an arithmetic number, because the mean of its divisors is an integer number (1687653091488).

Almost surely, 2^{21212210020012} is an apocalyptic number.

21212210020012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212210020012 is a deficient number, since it is larger than the sum of its proper divisors (19291464175700).

21212210020012 is a wasteful number, since it uses less digits than its factorization.

21212210020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90915309 (or 90915307 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212210020012 its reverse (21002001221212), we get a palindrome (42214211241224).

It can be divided in two parts, 21212 and 210020012, that multiplied together give a palindrome (4454944494544).

The spelling of 21212210020012 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, twenty thousand, twelve".