21035351353 has 4 divisors (see below), whose sum is σ = 22272724980. Its totient is φ = 19797977728.

The previous prime is 21035351341. The next prime is 21035351369. The reversal of 21035351353 is 35315353012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6011211024 + 15024140329 = 77532^2 + 122573^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035351353 - 2¹⁷ = 21035220281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035351053) 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, 618686788 + ... + 618686821.

It is an arithmetic number, because the mean of its divisors is an integer number (5568181245).

Almost surely, 2^21035351353 is an apocalyptic number.

It is an amenable number.

21035351353 is a deficient number, since it is larger than the sum of its proper divisors (1237373627).

21035351353 is a wasteful number, since it uses less digits than its factorization.

21035351353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237373626.

The product of its (nonzero) digits is 20250, while the sum is 31.

The spelling of 21035351353 in words is "twenty-one billion, thirty-five million, three hundred fifty-one thousand, three hundred fifty-three".