21605162640741 has 12 divisors (see below), whose sum is σ = 31207929143040. Its totient is φ = 14403223916520.

The previous prime is 21605162640739. The next prime is 21605162640749. The reversal of 21605162640741 is 14704626150612.

21605162640741 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 516 + 2 + 64 + 0 + 74 + 1 = 666.

It is not a de Polignac number, because 21605162640741 - 2¹ = 21605162640739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21605162640749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17524395 + ... + 18716696.

It is an arithmetic number, because the mean of its divisors is an integer number (2600660761920).

Almost surely, 2^{21605162640741} is an apocalyptic number.

It is an amenable number.

21605162640741 is a deficient number, since it is larger than the sum of its proper divisors (9602766502299).

21605162640741 is a wasteful number, since it uses less digits than its factorization.

21605162640741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36307336 (or 36307333 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 21605162640741 in words is "twenty-one trillion, six hundred five billion, one hundred sixty-two million, six hundred forty thousand, seven hundred forty-one".