21039341655 has 16 divisors (see below), whose sum is σ = 35126553600. Its totient is φ = 10733113248.

The previous prime is 21039341567. The next prime is 21039341657. The reversal of 21039341655 is 55614393012.

It is not a de Polignac number, because 21039341655 - 2¹⁵ = 21039308887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039341657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30491455 + ... + 30492144.

It is an arithmetic number, because the mean of its divisors is an integer number (2195409600).

Almost surely, 2^21039341655 is an apocalyptic number.

21039341655 is a deficient number, since it is larger than the sum of its proper divisors (14087211945).

21039341655 is a wasteful number, since it uses less digits than its factorization.

21039341655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60983630.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 21039341655 in words is "twenty-one billion, thirty-nine million, three hundred forty-one thousand, six hundred fifty-five".