21002021220111 has 8 divisors (see below), whose sum is σ = 28101644413440. Its totient is φ = 13951872753432.

The previous prime is 21002021220101. The next prime is 21002021220127. The reversal of 21002021220111 is 11102212020012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002021220111 - 2¹⁷ = 21002021089039 is a prime.

It is a super-2 number, since 2×21002021220111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002021220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12368680671 + ... + 12368682368.

It is an arithmetic number, because the mean of its divisors is an integer number (3512705551680).

Almost surely, 2^{21002021220111} is an apocalyptic number.

21002021220111 is a deficient number, since it is larger than the sum of its proper divisors (7099623193329).

21002021220111 is a wasteful number, since it uses less digits than its factorization.

21002021220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24737363325.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002021220111 its reverse (11102212020012), we get a palindrome (32104233240123).

The spelling of 21002021220111 in words is "twenty-one trillion, two billion, twenty-one million, two hundred twenty thousand, one hundred eleven".