21516142361 has 32 divisors (see below), whose sum is σ = 27041402880. Its totient is φ = 16700057856.

The previous prime is 21516142339. The next prime is 21516142363. The reversal of 21516142361 is 16324161512.

It is a cyclic number.

It is not a de Polignac number, because 21516142361 - 2²⁶ = 21449033497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21516142363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297386 + ... + 362588.

It is an arithmetic number, because the mean of its divisors is an integer number (845043840).

Almost surely, 2^21516142361 is an apocalyptic number.

It is an amenable number.

21516142361 is a deficient number, since it is larger than the sum of its proper divisors (5525260519).

21516142361 is a wasteful number, since it uses less digits than its factorization.

21516142361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65333.

The product of its digits is 8640, while the sum is 32.

The spelling of 21516142361 in words is "twenty-one billion, five hundred sixteen million, one hundred forty-two thousand, three hundred sixty-one".