21112220010021 has 8 divisors (see below), whose sum is σ = 32171001920064. Its totient is φ = 12064125720000.

The previous prime is 21112220009989. The next prime is 21112220010029. The reversal of 21112220010021 is 12001002221112.

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

It is not a de Polignac number, because 21112220010021 - 2⁵ = 21112220009989 is a prime.

It is a super-2 number, since 2×21112220010021² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112220010029) 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, 502671904980 + ... + 502671905021.

It is an arithmetic number, because the mean of its divisors is an integer number (4021375240008).

Almost surely, 2^{21112220010021} is an apocalyptic number.

21112220010021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21112220010021 is a deficient number, since it is larger than the sum of its proper divisors (11058781910043).

21112220010021 is a wasteful number, since it uses less digits than its factorization.

21112220010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005343810011.

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

Adding to 21112220010021 its reverse (12001002221112), we get a palindrome (33113222231133).

The spelling of 21112220010021 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, ten thousand, twenty-one".