13820021755 has 8 divisors (see below), whose sum is σ = 16623420624. Its totient is φ = 11029754400.

The previous prime is 13820021749. The next prime is 13820021767. The reversal of 13820021755 is 55712002831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13820021755 - 2⁵ = 13820021723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13820021755.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3280561 + ... + 3284770.

It is an arithmetic number, because the mean of its divisors is an integer number (2077927578).

Almost surely, 2^13820021755 is an apocalyptic number.

13820021755 is a deficient number, since it is larger than the sum of its proper divisors (2803398869).

13820021755 is an equidigital number, since it uses as much as digits as its factorization.

13820021755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565757.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 13820021755 in words is "thirteen billion, eight hundred twenty million, twenty-one thousand, seven hundred fifty-five".