21616425423115 has 16 divisors (see below), whose sum is σ = 26791182031968. Its totient is φ = 16734431990016.

The previous prime is 21616425423079. The next prime is 21616425423121. The reversal of 21616425423115 is 51132452461612.

It is a cyclic number.

It is not a de Polignac number, because 21616425423115 - 2²¹ = 21616423325963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558688989 + ... + 558727678.

It is an arithmetic number, because the mean of its divisors is an integer number (1674448876998).

Almost surely, 2^{21616425423115} is an apocalyptic number.

21616425423115 is a deficient number, since it is larger than the sum of its proper divisors (5174756608853).

21616425423115 is a wasteful number, since it uses less digits than its factorization.

21616425423115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117416798.

The product of its digits is 345600, while the sum is 43.

Adding to 21616425423115 its reverse (51132452461612), we get a palindrome (72748877884727).

The spelling of 21616425423115 in words is "twenty-one trillion, six hundred sixteen billion, four hundred twenty-five million, four hundred twenty-three thousand, one hundred fifteen".