21053042003 has 8 divisors (see below), whose sum is σ = 24067587072. Its totient is φ = 18040238856.

The previous prime is 21053041987. The next prime is 21053042033. The reversal of 21053042003 is 30024035012.

It is a happy number.

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 21053042003 - 2⁴ = 21053041987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21053042033) 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, 409475 + ... + 458012.

It is an arithmetic number, because the mean of its divisors is an integer number (3008448384).

Almost surely, 2^21053042003 is an apocalyptic number.

21053042003 is a deficient number, since it is larger than the sum of its proper divisors (3014545069).

21053042003 is an equidigital number, since it uses as much as digits as its factorization.

21053042003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870961.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21053042003 its reverse (30024035012), we get a palindrome (51077077015).

The spelling of 21053042003 in words is "twenty-one billion, fifty-three million, forty-two thousand, three".