21405342130264 has 16 divisors (see below), whose sum is σ = 40135067307720. Its totient is φ = 10702657514880.

The previous prime is 21405342130261. The next prime is 21405342130267. The reversal of 21405342130264 is 46203124350412.

It is an interprime number because it is at equal distance from previous prime (21405342130261) and next prime (21405342130267).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405342130261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8966944 + ... + 11100304.

Almost surely, 2^{21405342130264} is an apocalyptic number.

It is an amenable number.

21405342130264 is a deficient number, since it is larger than the sum of its proper divisors (18729725177456).

21405342130264 is a wasteful number, since it uses less digits than its factorization.

21405342130264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387570 (or 3387566 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21405342130264 its reverse (46203124350412), we get a palindrome (67608466480676).

The spelling of 21405342130264 in words is "twenty-one trillion, four hundred five billion, three hundred forty-two million, one hundred thirty thousand, two hundred sixty-four".