21021110020003 has 16 divisors (see below), whose sum is σ = 21789850832640. Its totient is φ = 20266523421984.

The previous prime is 21021110019983. The next prime is 21021110020063. The reversal of 21021110020003 is 30002001112012.

It is a cyclic number.

It is not a de Polignac number, because 21021110020003 - 2⁴¹ = 18822086764451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021110020063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7293901 + ... + 9759262.

It is an arithmetic number, because the mean of its divisors is an integer number (1361865677040).

Almost surely, 2^{21021110020003} is an apocalyptic number.

21021110020003 is a deficient number, since it is larger than the sum of its proper divisors (768740812637).

21021110020003 is a wasteful number, since it uses less digits than its factorization.

21021110020003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17053578.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21021110020003 its reverse (30002001112012), we get a palindrome (51023111132015).

The spelling of 21021110020003 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, twenty thousand, three".