21021002112111 has 8 divisors (see below), whose sum is σ = 28074177452544. Its totient is φ = 13990914089880.

The previous prime is 21021002112101. The next prime is 21021002112169. The reversal of 21021002112111 is 11121120012012.

It is a happy number.

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

It is not a de Polignac number, because 21021002112111 - 2⁵ = 21021002112079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021002112101) 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, 5771827425 + ... + 5771831066.

It is an arithmetic number, because the mean of its divisors is an integer number (3509272181568).

Almost surely, 2^{21021002112111} is an apocalyptic number.

21021002112111 is a deficient number, since it is larger than the sum of its proper divisors (7053175340433).

21021002112111 is a wasteful number, since it uses less digits than its factorization.

21021002112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11543659101.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21021002112111 its reverse (11121120012012), we get a palindrome (32142122124123).

The spelling of 21021002112111 in words is "twenty-one trillion, twenty-one billion, two million, one hundred twelve thousand, one hundred eleven".