21061211216012 has 24 divisors (see below), whose sum is σ = 40216142143632. Its totient is φ = 9571283712000.

The previous prime is 21061211215973. The next prime is 21061211216033.

It is a happy number.

21061211216012 is nontrivially palindromic in base 10.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49639193 + ... + 50061680.

It is an arithmetic number, because the mean of its divisors is an integer number (1675672589318).

Almost surely, 2^{21061211216012} is an apocalyptic number.

21061211216012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21061211216012 is a deficient number, since it is larger than the sum of its proper divisors (19154930927620).

21061211216012 is a wasteful number, since it uses less digits than its factorization.

21061211216012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99705689 (or 99705687 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21061211216012 in words is "twenty-one trillion, sixty-one billion, two hundred eleven million, two hundred sixteen thousand, twelve".