2154421543 has 4 divisors (see below), whose sum is σ = 2281152240. Its totient is φ = 2027690848.

The previous prime is 2154421541. The next prime is 2154421553. The reversal of 2154421543 is 3451244512.

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

It is a cyclic number.

It is not a de Polignac number, because 2154421543 - 2¹ = 2154421541 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 (2154421541) 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, 63365323 + ... + 63365356.

It is an arithmetic number, because the mean of its divisors is an integer number (570288060).

Almost surely, 2^2154421543 is an apocalyptic number.

2154421543 is a deficient number, since it is larger than the sum of its proper divisors (126730697).

2154421543 is a wasteful number, since it uses less digits than its factorization.

2154421543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126730696.

The product of its digits is 19200, while the sum is 31.

The square root of 2154421543 is about 46415.7467138039. The cubic root of 2154421543 is about 1291.5470378634.

The spelling of 2154421543 in words is "two billion, one hundred fifty-four million, four hundred twenty-one thousand, five hundred forty-three".