21019704553 has 8 divisors (see below), whose sum is σ = 22340786688. Its totient is φ = 19708025664.

The previous prime is 21019704533. The next prime is 21019704611. The reversal of 21019704553 is 35540791012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21019704553 - 2⁵ = 21019704521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21019704533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2346201 + ... + 2355142.

It is an arithmetic number, because the mean of its divisors is an integer number (2792598336).

Almost surely, 2^21019704553 is an apocalyptic number.

It is an amenable number.

21019704553 is a deficient number, since it is larger than the sum of its proper divisors (1321082135).

21019704553 is a wasteful number, since it uses less digits than its factorization.

21019704553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701623.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 21019704553 in words is "twenty-one billion, nineteen million, seven hundred four thousand, five hundred fifty-three".