21602651727113 has 4 divisors (see below), whose sum is σ = 21760335316500. Its totient is φ = 21444968137728.

The previous prime is 21602651727091. The next prime is 21602651727127. The reversal of 21602651727113 is 31172715620612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7509857929744 + 14092793797369 = 2740412^2 + 3754037^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21602651727113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602651727143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78841794488 + ... + 78841794761.

It is an arithmetic number, because the mean of its divisors is an integer number (5440083829125).

Almost surely, 2^{21602651727113} is an apocalyptic number.

It is an amenable number.

21602651727113 is a deficient number, since it is larger than the sum of its proper divisors (157683589387).

21602651727113 is a wasteful number, since it uses less digits than its factorization.

21602651727113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157683589386.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 21602651727113 in words is "twenty-one trillion, six hundred two billion, six hundred fifty-one million, seven hundred twenty-seven thousand, one hundred thirteen".