21020202212011 has 4 divisors (see below), whose sum is σ = 21308150187592. Its totient is φ = 20732254236432.

The previous prime is 21020202211979. The next prime is 21020202212021. The reversal of 21020202212011 is 11021220202012.

It is a happy number.

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 21020202212011 - 2⁵ = 21020202211979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020202212021) 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, 143973987681 + ... + 143973987826.

It is an arithmetic number, because the mean of its divisors is an integer number (5327037546898).

Almost surely, 2^{21020202212011} is an apocalyptic number.

21020202212011 is a deficient number, since it is larger than the sum of its proper divisors (287947975581).

21020202212011 is an equidigital number, since it uses as much as digits as its factorization.

21020202212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287947975580.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020202212011 its reverse (11021220202012), we get a palindrome (32041422414023).

The spelling of 21020202212011 in words is "twenty-one trillion, twenty billion, two hundred two million, two hundred twelve thousand, eleven".