13655552421 has 32 divisors (see below), whose sum is σ = 21598560256. Its totient is φ = 7509672000.

The previous prime is 13655552411. The next prime is 13655552431. The reversal of 13655552421 is 12425555631.

It is an interprime number because it is at equal distance from previous prime (13655552411) and next prime (13655552431).

It is not a de Polignac number, because 13655552421 - 2⁹ = 13655551909 is a prime.

It is a super-2 number, since 2×13655552421² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13655552421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13655552401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59886 + ... + 175776.

It is an arithmetic number, because the mean of its divisors is an integer number (674955008).

Almost surely, 2^13655552421 is an apocalyptic number.

It is an amenable number.

13655552421 is a deficient number, since it is larger than the sum of its proper divisors (7943007835).

13655552421 is a wasteful number, since it uses less digits than its factorization.

13655552421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116113.

The product of its digits is 180000, while the sum is 39.

The spelling of 13655552421 in words is "thirteen billion, six hundred fifty-five million, five hundred fifty-two thousand, four hundred twenty-one".