21516151115653 has 8 divisors (see below), whose sum is σ = 22656819020000. Its totient is φ = 20376307101168.

The previous prime is 21516151115623. The next prime is 21516151115671. The reversal of 21516151115653 is 35651115161512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21516151115653 - 2¹³ = 21516151107461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516151115623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205918851 + ... + 206023312.

It is an arithmetic number, because the mean of its divisors is an integer number (2832102377500).

Almost surely, 2^{21516151115653} is an apocalyptic number.

It is an amenable number.

21516151115653 is a deficient number, since it is larger than the sum of its proper divisors (1140667904347).

21516151115653 is a wasteful number, since it uses less digits than its factorization.

21516151115653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411944931.

The product of its digits is 135000, while the sum is 43.

The spelling of 21516151115653 in words is "twenty-one trillion, five hundred sixteen billion, one hundred fifty-one million, one hundred fifteen thousand, six hundred fifty-three".