21345320443393 has 4 divisors (see below), whose sum is σ = 21345335578048. Its totient is φ = 21345305308740.

The previous prime is 21345320443373. The next prime is 21345320443439. The reversal of 21345320443393 is 39334402354312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21345320443393 - 2⁹ = 21345320442881 is a prime.

It is a super-2 number, since 2×21345320443393² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21345320443303) 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, 5206221 + ... + 8354362.

It is an arithmetic number, because the mean of its divisors is an integer number (5336333894512).

Almost surely, 2^{21345320443393} is an apocalyptic number.

It is an amenable number.

21345320443393 is a deficient number, since it is larger than the sum of its proper divisors (15134655).

21345320443393 is a wasteful number, since it uses less digits than its factorization.

21345320443393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15134654.

The product of its (nonzero) digits is 2799360, while the sum is 46.

The spelling of 21345320443393 in words is "twenty-one trillion, three hundred forty-five billion, three hundred twenty million, four hundred forty-three thousand, three hundred ninety-three".