21602426601655 has 16 divisors (see below), whose sum is σ = 25942018975200. Its totient is φ = 17269207521280.

The previous prime is 21602426601653. The next prime is 21602426601719. The reversal of 21602426601655 is 55610662420612.

It is not a de Polignac number, because 21602426601655 - 2¹ = 21602426601653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602426601653) 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, 40617036 + ... + 41145454.

It is an arithmetic number, because the mean of its divisors is an integer number (1621376185950).

Almost surely, 2^{21602426601655} is an apocalyptic number.

21602426601655 is a deficient number, since it is larger than the sum of its proper divisors (4339592373545).

21602426601655 is a wasteful number, since it uses less digits than its factorization.

21602426601655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534434.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 21602426601655 in words is "twenty-one trillion, six hundred two billion, four hundred twenty-six million, six hundred one thousand, six hundred fifty-five".