21308757035 has 4 divisors (see below), whose sum is σ = 25570508448. Its totient is φ = 17047005624.

The previous prime is 21308757011. The next prime is 21308757053. The reversal of 21308757035 is 53075780312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21308757035 - 2²² = 21304562731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21308756983 and 21308757001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130875699 + ... + 2130875708.

It is an arithmetic number, because the mean of its divisors is an integer number (6392627112).

Almost surely, 2^21308757035 is an apocalyptic number.

21308757035 is a deficient number, since it is larger than the sum of its proper divisors (4261751413).

21308757035 is an equidigital number, since it uses as much as digits as its factorization.

21308757035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261751412.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 21308757035 in words is "twenty-one billion, three hundred eight million, seven hundred fifty-seven thousand, thirty-five".