21004334343246 has 64 divisors (see below), whose sum is σ = 42285738700800. Its totient is φ = 6955424248416.

The previous prime is 21004334343203. The next prime is 21004334343247. The reversal of 21004334343246 is 64234343340012.

It is a super-2 number, since 2×21004334343246² (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 (21004334343247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1329127981 + ... + 1329143783.

It is an arithmetic number, because the mean of its divisors is an integer number (660714667200).

Almost surely, 2^{21004334343246} is an apocalyptic number.

21004334343246 is an abundant number, since it is smaller than the sum of its proper divisors (21281404357554).

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

21004334343246 is a wasteful number, since it uses less digits than its factorization.

21004334343246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18213.

The product of its (nonzero) digits is 497664, while the sum is 39.

Adding to 21004334343246 its reverse (64234343340012), we get a palindrome (85238677683258).

The spelling of 21004334343246 in words is "twenty-one trillion, four billion, three hundred thirty-four million, three hundred forty-three thousand, two hundred forty-six".