21603261713427 has 8 divisors (see below), whose sum is σ = 32004832168080. Its totient is φ = 14402174475600.

The previous prime is 21603261713401. The next prime is 21603261713459. The reversal of 21603261713427 is 72431716230612.

It is a happy number.

21603261713427 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 3 + 2 + 617 + 1 + 3 + 4 + 27 = 666.

It is not a de Polignac number, because 21603261713427 - 2⁸ = 21603261713171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21603221713427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400060402074 + ... + 400060402127.

It is an arithmetic number, because the mean of its divisors is an integer number (4000604021010).

Almost surely, 2^{21603261713427} is an apocalyptic number.

21603261713427 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21603261713427 is a deficient number, since it is larger than the sum of its proper divisors (10401570454653).

21603261713427 is an equidigital number, since it uses as much as digits as its factorization.

21603261713427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800120804210 (or 800120804204 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 21603261713427 in words is "twenty-one trillion, six hundred three billion, two hundred sixty-one million, seven hundred thirteen thousand, four hundred twenty-seven".