21020220011 has 8 divisors (see below), whose sum is σ = 25287482880. Its totient is φ = 17069050728.

The previous prime is 21020219963. The next prime is 21020220037. The reversal of 21020220011 is 11002202012.

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 21020220011 - 2¹⁰ = 21020218987 is a prime.

It is a super-3 number, since 3×21020220011³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020219974 and 21020220001.

It is not an unprimeable number, because it can be changed into a prime (21020220211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79023251 + ... + 79023516.

It is an arithmetic number, because the mean of its divisors is an integer number (3160935360).

Almost surely, 2^21020220011 is an apocalyptic number.

21020220011 is a deficient number, since it is larger than the sum of its proper divisors (4267262869).

21020220011 is a wasteful number, since it uses less digits than its factorization.

21020220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158046793.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21020220011 its reverse (11002202012), we get a palindrome (32022422023).

The spelling of 21020220011 in words is "twenty-one billion, twenty million, two hundred twenty thousand, eleven".