2154214340405 has 32 divisors (see below), whose sum is σ = 2650962384000. Its totient is φ = 1680092070912.

The previous prime is 2154214340401. The next prime is 2154214340419. The reversal of 2154214340405 is 5040434124512.

It is a happy number.

It is not a de Polignac number, because 2154214340405 - 2² = 2154214340401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154214340401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11423321 + ... + 11610369.

It is an arithmetic number, because the mean of its divisors is an integer number (82842574500).

Almost surely, 2^{2154214340405} is an apocalyptic number.

It is an amenable number.

2154214340405 is a deficient number, since it is larger than the sum of its proper divisors (496748043595).

2154214340405 is a wasteful number, since it uses less digits than its factorization.

2154214340405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187493.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 2154214340405 its reverse (5040434124512), we get a palindrome (7194648464917).

The spelling of 2154214340405 in words is "two trillion, one hundred fifty-four billion, two hundred fourteen million, three hundred forty thousand, four hundred five".