21221112000021 has 8 divisors (see below), whose sum is σ = 28298017893024. Its totient is φ = 14145807053520.

The previous prime is 21221111999933. The next prime is 21221112000029. The reversal of 21221112000021 is 12000021112212.

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

It is not a de Polignac number, because 21221112000021 - 2²¹ = 21221109902869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221112000029) 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, 400205695 + ... + 400258716.

It is an arithmetic number, because the mean of its divisors is an integer number (3537252236628).

Almost surely, 2^{21221112000021} is an apocalyptic number.

It is an amenable number.

21221112000021 is a deficient number, since it is larger than the sum of its proper divisors (7076905893003).

21221112000021 is an equidigital number, since it uses as much as digits as its factorization.

21221112000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800473251.

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

Adding to 21221112000021 its reverse (12000021112212), we get a palindrome (33221133112233).

The spelling of 21221112000021 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-one", and thus it is an aban number.