21012101211012 has 12 divisors (see below), whose sum is σ = 49028236159056. Its totient is φ = 7004033737000.

The previous prime is 21012101211007. The next prime is 21012101211029. The reversal of 21012101211012 is 21011210121012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21012101210982 and 21012101211000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875504217114 + ... + 875504217137.

It is an arithmetic number, because the mean of its divisors is an integer number (4085686346588).

Almost surely, 2^{21012101211012} is an apocalyptic number.

It is an amenable number.

21012101211012 is an abundant number, since it is smaller than the sum of its proper divisors (28016134948044).

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

21012101211012 is a wasteful number, since it uses less digits than its factorization.

21012101211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751008434258 (or 1751008434256 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012101211012 its reverse (21011210121012), we get a palindrome (42023311332024).

The spelling of 21012101211012 in words is "twenty-one trillion, twelve billion, one hundred one million, two hundred eleven thousand, twelve".