21204377340212 has 12 divisors (see below), whose sum is σ = 40481084013216. Its totient is φ = 9638353336440.

The previous prime is 21204377340197. The next prime is 21204377340217.

21204377340212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21204377340212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204377340217) by changing a digit.

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, 240958833368 + ... + 240958833455.

It is an arithmetic number, because the mean of its divisors is an integer number (3373423667768).

Almost surely, 2^{21204377340212} is an apocalyptic number.

21204377340212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21204377340212 is a deficient number, since it is larger than the sum of its proper divisors (19276706673004).

21204377340212 is a wasteful number, since it uses less digits than its factorization.

21204377340212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481917666838 (or 481917666836 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 38.

It can be divided in two parts, 2120437 and 7340212, that added together give a palindrome (9460649).

The spelling of 21204377340212 in words is "twenty-one trillion, two hundred four billion, three hundred seventy-seven million, three hundred forty thousand, two hundred twelve".