21021220211011 has 8 divisors (see below), whose sum is σ = 21166936653600. Its totient is φ = 20875565561088.

The previous prime is 21021220211009. The next prime is 21021220211023. The reversal of 21021220211011 is 11011202212012.

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 21021220211011 - 2¹ = 21021220211009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021220211081) 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, 14765326 + ... + 16126291.

It is an arithmetic number, because the mean of its divisors is an integer number (2645867081700).

Almost surely, 2^{21021220211011} is an apocalyptic number.

21021220211011 is a deficient number, since it is larger than the sum of its proper divisors (145716442589).

21021220211011 is a wasteful number, since it uses less digits than its factorization.

21021220211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30896333.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021220211011 its reverse (11011202212012), we get a palindrome (32032422423023).

The spelling of 21021220211011 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, two hundred eleven thousand, eleven".