21020213121003 has 20 divisors (see below), whose sum is σ = 32483343396240. Its totient is φ = 13530252122352.

The previous prime is 21020213120917. The next prime is 21020213121041. The reversal of 21020213121003 is 30012131202012.

21020213121003 is a `hidden beast` number, since 210 + 20 + 21 + 312 + 100 + 3 = 666.

It is not a de Polignac number, because 21020213121003 - 2¹⁷ = 21020212989931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020213111003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4474287375 + ... + 4474292072.

It is an arithmetic number, because the mean of its divisors is an integer number (1624167169812).

Almost surely, 2^{21020213121003} is an apocalyptic number.

21020213121003 is a deficient number, since it is larger than the sum of its proper divisors (11463130275237).

21020213121003 is an equidigital number, since it uses as much as digits as its factorization.

21020213121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8948579488 (or 8948579479 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21020213121003 its reverse (30012131202012), we get a palindrome (51032344323015).

The spelling of 21020213121003 in words is "twenty-one trillion, twenty billion, two hundred thirteen million, one hundred twenty-one thousand, three".