21373530232705 has 12 divisors (see below), whose sum is σ = 29835703427220. Its totient is φ = 14656135016544.

The previous prime is 21373530232627. The next prime is 21373530232739. The reversal of 21373530232705 is 50723203537312.

It can be written as a sum of positive squares in 2 ways, for example, as 15218362749184 + 6155167483521 = 3901072^2 + 2480961^2 .

It is not a de Polignac number, because 21373530232705 - 2⁹ = 21373530232193 is a prime.

It is a super-3 number, since 3×21373530232705³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43619449210 + ... + 43619449699.

It is an arithmetic number, because the mean of its divisors is an integer number (2486308618935).

Almost surely, 2^{21373530232705} is an apocalyptic number.

It is an amenable number.

21373530232705 is a deficient number, since it is larger than the sum of its proper divisors (8462173194515).

21373530232705 is an equidigital number, since it uses as much as digits as its factorization.

21373530232705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87238898928 (or 87238898921 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 43.

The spelling of 21373530232705 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred thirty million, two hundred thirty-two thousand, seven hundred five".