21516151114412 has 6 divisors (see below), whose sum is σ = 37653264450228. Its totient is φ = 10758075557204.

The previous prime is 21516151114379. The next prime is 21516151114427. The reversal of 21516151114412 is 21441115161512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2689518889298 + ... + 2689518889305.

It is an arithmetic number, because the mean of its divisors is an integer number (6275544075038).

Almost surely, 2^{21516151114412} is an apocalyptic number.

It is an amenable number.

21516151114412 is a deficient number, since it is larger than the sum of its proper divisors (16137113335816).

21516151114412 is a wasteful number, since it uses less digits than its factorization.

21516151114412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5379037778607 (or 5379037778605 counting only the distinct ones).

The product of its digits is 9600, while the sum is 35.

Adding to 21516151114412 its reverse (21441115161512), we get a palindrome (42957266275924).

The spelling of 21516151114412 in words is "twenty-one trillion, five hundred sixteen billion, one hundred fifty-one million, one hundred fourteen thousand, four hundred twelve".