13755346621 has 4 divisors (see below), whose sum is σ = 13755584700. Its totient is φ = 13755108544.

The previous prime is 13755346543. The next prime is 13755346639. The reversal of 13755346621 is 12664355731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 256160025 + 13499186596 = 16005^2 + 116186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13755346621 is a prime.

It is a super-2 number, since 2×13755346621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13755346021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28965 + ... + 168373.

It is an arithmetic number, because the mean of its divisors is an integer number (3438896175).

Almost surely, 2^13755346621 is an apocalyptic number.

It is an amenable number.

13755346621 is a deficient number, since it is larger than the sum of its proper divisors (238079).

13755346621 is an equidigital number, since it uses as much as digits as its factorization.

13755346621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238078.

The product of its digits is 453600, while the sum is 43.

The spelling of 13755346621 in words is "thirteen billion, seven hundred fifty-five million, three hundred forty-six thousand, six hundred twenty-one".