21122214064 has 80 divisors (see below), whose sum is σ = 48365475840. Its totient is φ = 8744739840.

The previous prime is 21122214053. The next prime is 21122214103. The reversal of 21122214064 is 46041222112.

It is a super-2 number, since 2×21122214064² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2053767 + ... + 2064025.

It is an arithmetic number, because the mean of its divisors is an integer number (604568448).

Almost surely, 2^21122214064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122214064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24182737920).

21122214064 is an abundant number, since it is smaller than the sum of its proper divisors (27243261776).

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

21122214064 is a wasteful number, since it uses less digits than its factorization.

21122214064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10898 (or 10892 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21122214064 its reverse (46041222112), we get a palindrome (67163436176).

The spelling of 21122214064 in words is "twenty-one billion, one hundred twenty-two million, two hundred fourteen thousand, sixty-four".