21122783375910 has 128 divisors (see below), whose sum is σ = 53466619345920. Its totient is φ = 5335335129600.

The previous prime is 21122783375909. The next prime is 21122783375929. The reversal of 21122783375910 is 1957338722112.

It is a happy number.

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 63 ways as a sum of consecutive naturals, for example, 3696636 + ... + 7477344.

It is an arithmetic number, because the mean of its divisors is an integer number (417707963640).

Almost surely, 2^{21122783375910} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122783375910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26733309672960).

21122783375910 is an abundant number, since it is smaller than the sum of its proper divisors (32343835970010).

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

21122783375910 is a wasteful number, since it uses less digits than its factorization.

21122783375910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780894.

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 21122783375910 in words is "twenty-one trillion, one hundred twenty-two billion, seven hundred eighty-three million, three hundred seventy-five thousand, nine hundred ten".