21727427254 has 16 divisors (see below), whose sum is σ = 35115056928. Its totient is φ = 10023213312.

The previous prime is 21727427251. The next prime is 21727427317. The reversal of 21727427254 is 45272472712.

It is a self number, because there is not a number n which added to its sum of digits gives 21727427254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727427251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145947 + ... + 254470.

It is an arithmetic number, because the mean of its divisors is an integer number (2194691058).

Almost surely, 2^21727427254 is an apocalyptic number.

21727427254 is a deficient number, since it is larger than the sum of its proper divisors (13387629674).

21727427254 is a wasteful number, since it uses less digits than its factorization.

21727427254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402519.

The product of its digits is 439040, while the sum is 43.

Adding to 21727427254 its reverse (45272472712), we get a palindrome (66999899966).

The spelling of 21727427254 in words is "twenty-one billion, seven hundred twenty-seven million, four hundred twenty-seven thousand, two hundred fifty-four".