21002222020111 has 8 divisors (see below), whose sum is σ = 21017645609040. Its totient is φ = 20986804094208.

The previous prime is 21002222020063. The next prime is 21002222020127. The reversal of 21002222020111 is 11102022220012.

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 21002222020111 - 2⁹ = 21002222019599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222020511) 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, 6018600 + ... + 8844658.

It is an arithmetic number, because the mean of its divisors is an integer number (2627205701130).

Almost surely, 2^{21002222020111} is an apocalyptic number.

21002222020111 is a deficient number, since it is larger than the sum of its proper divisors (15423588929).

21002222020111 is a wasteful number, since it uses less digits than its factorization.

21002222020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831513.

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

Adding to 21002222020111 its reverse (11102022220012), we get a palindrome (32104244240123).

The spelling of 21002222020111 in words is "twenty-one trillion, two billion, two hundred twenty-two million, twenty thousand, one hundred eleven".