21522204312064 has 80 divisors (see below), whose sum is σ = 45119957762880. Its totient is φ = 10236358471680.

The previous prime is 21522204312017. The next prime is 21522204312071. The reversal of 21522204312064 is 46021340222512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2917254 + ... + 7180165.

It is an arithmetic number, because the mean of its divisors is an integer number (563999472036).

Almost surely, 2^{21522204312064} is an apocalyptic number.

It is an amenable number.

21522204312064 is an abundant number, since it is smaller than the sum of its proper divisors (23597753450816).

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

21522204312064 is a wasteful number, since it uses less digits than its factorization.

21522204312064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10097641 (or 10097625 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 21522204312064 its reverse (46021340222512), we get a palindrome (67543544534576).

The spelling of 21522204312064 in words is "twenty-one trillion, five hundred twenty-two billion, two hundred four million, three hundred twelve thousand, sixty-four".