21346523347 has 16 divisors (see below), whose sum is σ = 21769961472. Its totient is φ = 20927773440.

The previous prime is 21346523291. The next prime is 21346523371. The reversal of 21346523347 is 74332564312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21346523347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21346523147) 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 15 ways as a sum of consecutive naturals, for example, 13587072 + ... + 13588642.

It is an arithmetic number, because the mean of its divisors is an integer number (1360622592).

Almost surely, 2^21346523347 is an apocalyptic number.

21346523347 is a deficient number, since it is larger than the sum of its proper divisors (423438125).

21346523347 is a wasteful number, since it uses less digits than its factorization.

21346523347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898.

The product of its digits is 362880, while the sum is 40.

The spelling of 21346523347 in words is "twenty-one billion, three hundred forty-six million, five hundred twenty-three thousand, three hundred forty-seven".