21073097635 has 4 divisors (see below), whose sum is σ = 25287717168. Its totient is φ = 16858478104.

The previous prime is 21073097629. The next prime is 21073097659. The reversal of 21073097635 is 53679037012.

It is a happy number.

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 21073097635 - 2⁵ = 21073097603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21073097591 and 21073097600.

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, 2107309759 + ... + 2107309768.

It is an arithmetic number, because the mean of its divisors is an integer number (6321929292).

Almost surely, 2^21073097635 is an apocalyptic number.

21073097635 is a deficient number, since it is larger than the sum of its proper divisors (4214619533).

21073097635 is an equidigital number, since it uses as much as digits as its factorization.

21073097635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214619532.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 21073097635 in words is "twenty-one billion, seventy-three million, ninety-seven thousand, six hundred thirty-five".