21424614155 has 8 divisors (see below), whose sum is σ = 29382328032. Its totient is φ = 14691163968.

The previous prime is 21424614151. The next prime is 21424614179. The reversal of 21424614155 is 55141642412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21424614155 - 2² = 21424614151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 612131833 = 21424614155 / (2 + 1 + 4 + 2 + 4 + 6 + 1 + 4 + 1 + 5 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21424614151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306065882 + ... + 306065951.

It is an arithmetic number, because the mean of its divisors is an integer number (3672791004).

Almost surely, 2^21424614155 is an apocalyptic number.

21424614155 is a deficient number, since it is larger than the sum of its proper divisors (7957713877).

21424614155 is an equidigital number, since it uses as much as digits as its factorization.

21424614155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612131845.

The product of its digits is 38400, while the sum is 35.

The spelling of 21424614155 in words is "twenty-one billion, four hundred twenty-four million, six hundred fourteen thousand, one hundred fifty-five".