21322061666115 has 96 divisors (see below), whose sum is σ = 39826616383296. Its totient is φ = 9712542228480.

The previous prime is 21322061666069. The next prime is 21322061666117. The reversal of 21322061666115 is 51166616022312.

It is not a de Polignac number, because 21322061666115 - 2¹⁵ = 21322061633347 is a prime.

It is a super-2 number, since 2×21322061666115² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21322061666117) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 234693739 + ... + 234784571.

It is an arithmetic number, because the mean of its divisors is an integer number (414860587326).

Almost surely, 2^{21322061666115} is an apocalyptic number.

21322061666115 is a deficient number, since it is larger than the sum of its proper divisors (18504554717181).

21322061666115 is a wasteful number, since it uses less digits than its factorization.

21322061666115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91989 (or 91982 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

Adding to 21322061666115 its reverse (51166616022312), we get a palindrome (72488677688427).

The spelling of 21322061666115 in words is "twenty-one trillion, three hundred twenty-two billion, sixty-one million, six hundred sixty-six thousand, one hundred fifteen".