21220101011 has 8 divisors (see below), whose sum is σ = 21582067200. Its totient is φ = 20858211720.

The previous prime is 21220100977. The next prime is 21220101013. The reversal of 21220101011 is 11010102212.

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 21220101011 - 2¹⁰ = 21220099987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220100983 and 21220101001.

It is not an unprimeable number, because it can be changed into a prime (21220101013) 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, 946550 + ... + 968708.

It is an arithmetic number, because the mean of its divisors is an integer number (2697758400).

Almost surely, 2^21220101011 is an apocalyptic number.

21220101011 is a deficient number, since it is larger than the sum of its proper divisors (361966189).

21220101011 is a wasteful number, since it uses less digits than its factorization.

21220101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38449.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21220101011 its reverse (11010102212), we get a palindrome (32230203223).

The spelling of 21220101011 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, eleven".