21343402015 has 16 divisors (see below), whose sum is σ = 27592846848. Its totient is φ = 15755222016.

The previous prime is 21343401997. The next prime is 21343402019. The reversal of 21343402015 is 51020434312.

It is a cyclic number.

It is not a de Polignac number, because 21343402015 - 2⁹ = 21343401503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343402019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110914 + ... + 234496.

It is an arithmetic number, because the mean of its divisors is an integer number (1724552928).

Almost surely, 2^21343402015 is an apocalyptic number.

21343402015 is a deficient number, since it is larger than the sum of its proper divisors (6249444833).

21343402015 is a wasteful number, since it uses less digits than its factorization.

21343402015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126258.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21343402015 its reverse (51020434312), we get a palindrome (72363836327).

The spelling of 21343402015 in words is "twenty-one billion, three hundred forty-three million, four hundred two thousand, fifteen".