21216362422064 has 10 divisors (see below), whose sum is σ = 41106702192780. Its totient is φ = 10608181211024.

The previous prime is 21216362422063. The next prime is 21216362422091. The reversal of 21216362422064 is 46022426361212.

It is not an unprimeable number, because it can be changed into a prime (21216362422063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663011325674 + ... + 663011325705.

It is an arithmetic number, because the mean of its divisors is an integer number (4110670219278).

Almost surely, 2^{21216362422064} is an apocalyptic number.

It is an amenable number.

21216362422064 is a deficient number, since it is larger than the sum of its proper divisors (19890339770716).

21216362422064 is a wasteful number, since it uses less digits than its factorization.

21216362422064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326022651387 (or 1326022651381 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 41.

Adding to 21216362422064 its reverse (46022426361212), we get a palindrome (67238788783276).

The spelling of 21216362422064 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, four hundred twenty-two thousand, sixty-four".