21211222000021 has 8 divisors (see below), whose sum is σ = 21379838090688. Its totient is φ = 21042707400000.

The previous prime is 21211222000013. The next prime is 21211222000039. The reversal of 21211222000021 is 12000022211212.

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 21211222000021 - 2³ = 21211222000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211221999959 and 21211222000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211222000321) 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, 24952980 + ... + 25789021.

It is an arithmetic number, because the mean of its divisors is an integer number (2672479761336).

Almost surely, 2^{21211222000021} is an apocalyptic number.

It is an amenable number.

21211222000021 is a deficient number, since it is larger than the sum of its proper divisors (168616090667).

21211222000021 is a wasteful number, since it uses less digits than its factorization.

21211222000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50745323.

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

Adding to 21211222000021 its reverse (12000022211212), we get a palindrome (33211244211233).

The spelling of 21211222000021 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, twenty-one", and thus it is an aban number.