2105554350421 has 4 divisors (see below), whose sum is σ = 2111915542144. Its totient is φ = 2099193158700.

The previous prime is 2105554350379. The next prime is 2105554350439. The reversal of 2105554350421 is 1240534555012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2105554350421 - 2¹⁹ = 2105553826133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105554350491) 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, 3180595365 + ... + 3180596026.

It is an arithmetic number, because the mean of its divisors is an integer number (527978885536).

Almost surely, 2^{2105554350421} is an apocalyptic number.

It is an amenable number.

2105554350421 is a deficient number, since it is larger than the sum of its proper divisors (6361191723).

2105554350421 is an equidigital number, since it uses as much as digits as its factorization.

2105554350421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6361191722.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 2105554350421 in words is "two trillion, one hundred five billion, five hundred fifty-four million, three hundred fifty thousand, four hundred twenty-one".