21211020006 has 96 divisors (see below), whose sum is σ = 50129210880. Its totient is φ = 5959546560.

The previous prime is 21211019989. The next prime is 21211020119. The reversal of 21211020006 is 60002011212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 631960 + ... + 664676.

It is an arithmetic number, because the mean of its divisors is an integer number (522179280).

Almost surely, 2^21211020006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211020006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25064605440).

21211020006 is an abundant number, since it is smaller than the sum of its proper divisors (28918190874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211020006 is a wasteful number, since it uses less digits than its factorization.

21211020006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32810 (or 32799 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21211020006 its reverse (60002011212), we get a palindrome (81213031218).

The spelling of 21211020006 in words is "twenty-one billion, two hundred eleven million, twenty thousand, six".