13155204223021 has 16 divisors (see below), whose sum is σ = 15192563886976. Its totient is φ = 11157402433536.

The previous prime is 13155204222907. The next prime is 13155204223039. The reversal of 13155204223021 is 12032240255131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13155204223021 - 2¹⁵ = 13155204190253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155204220021) 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, 1443685 + ... + 5328661.

It is an arithmetic number, because the mean of its divisors is an integer number (949535242936).

Almost surely, 2^{13155204223021} is an apocalyptic number.

It is an amenable number.

13155204223021 is a deficient number, since it is larger than the sum of its proper divisors (2037359663955).

13155204223021 is an equidigital number, since it uses as much as digits as its factorization.

13155204223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890068.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 13155204223021 its reverse (12032240255131), we get a palindrome (25187444478152).

The spelling of 13155204223021 in words is "thirteen trillion, one hundred fifty-five billion, two hundred four million, two hundred twenty-three thousand, twenty-one".