21541061427 has 4 divisors (see below), whose sum is σ = 28721415240. Its totient is φ = 14360707616.

The previous prime is 21541061407. The next prime is 21541061429. The reversal of 21541061427 is 72416014512.

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 21541061427 - 2¹⁰ = 21541060403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21541061429) 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, 3590176902 + ... + 3590176907.

It is an arithmetic number, because the mean of its divisors is an integer number (7180353810).

Almost surely, 2^21541061427 is an apocalyptic number.

21541061427 is a deficient number, since it is larger than the sum of its proper divisors (7180353813).

21541061427 is an equidigital number, since it uses as much as digits as its factorization.

21541061427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7180353812.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 21541061427 its reverse (72416014512), we get a palindrome (93957075939).

The spelling of 21541061427 in words is "twenty-one billion, five hundred forty-one million, sixty-one thousand, four hundred twenty-seven".