21220010011206 has 24 divisors (see below), whose sum is σ = 47975674808880. Its totient is φ = 6765800293296.

The previous prime is 21220010011181. The next prime is 21220010011247. The reversal of 21220010011206 is 60211001002212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25628031001 + ... + 25628031828.

It is an arithmetic number, because the mean of its divisors is an integer number (1998986450370).

Almost surely, 2^{21220010011206} is an apocalyptic number.

21220010011206 is an abundant number, since it is smaller than the sum of its proper divisors (26755664797674).

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

21220010011206 is a wasteful number, since it uses less digits than its factorization.

21220010011206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51256062860 (or 51256062857 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21220010011206 its reverse (60211001002212), we get a palindrome (81431011013418).

The spelling of 21220010011206 in words is "twenty-one trillion, two hundred twenty billion, ten million, eleven thousand, two hundred six".