2156224300487 has 4 divisors (see below), whose sum is σ = 2158752114120. Its totient is φ = 2153696486856.

The previous prime is 2156224300471. The next prime is 2156224300493. The reversal of 2156224300487 is 7840034226512.

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 2156224300487 - 2⁴ = 2156224300471 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 (2156224300187) 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, 1263905537 + ... + 1263907242.

It is an arithmetic number, because the mean of its divisors is an integer number (539688028530).

Almost surely, 2^{2156224300487} is an apocalyptic number.

2156224300487 is a deficient number, since it is larger than the sum of its proper divisors (2527813633).

2156224300487 is an equidigital number, since it uses as much as digits as its factorization.

2156224300487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527813632.

The product of its (nonzero) digits is 645120, while the sum is 44.

Adding to 2156224300487 its reverse (7840034226512), we get a palindrome (9996258526999).

The spelling of 2156224300487 in words is "two trillion, one hundred fifty-six billion, two hundred twenty-four million, three hundred thousand, four hundred eighty-seven".