21020220021011 has 4 divisors (see below), whose sum is σ = 21698291634624. Its totient is φ = 20342148407400.

The previous prime is 21020220021001. The next prime is 21020220021019. The reversal of 21020220021011 is 11012002202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020220021011 - 2³⁴ = 21003040151827 is a prime.

It is a super-3 number, since 3×21020220021011³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020220021019) 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, 339035806760 + ... + 339035806821.

It is an arithmetic number, because the mean of its divisors is an integer number (5424572908656).

Almost surely, 2^{21020220021011} is an apocalyptic number.

21020220021011 is a deficient number, since it is larger than the sum of its proper divisors (678071613613).

21020220021011 is an equidigital number, since it uses as much as digits as its factorization.

21020220021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678071613612.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020220021011 its reverse (11012002202012), we get a palindrome (32032222223023).

The spelling of 21020220021011 in words is "twenty-one trillion, twenty billion, two hundred twenty million, twenty-one thousand, eleven".