21424310855 has 8 divisors (see below), whose sum is σ = 25710943200. Its totient is φ = 17138268576.

The previous prime is 21424310839. The next prime is 21424310857. The reversal of 21424310855 is 55801342412.

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 21424310855 - 2⁴ = 21424310839 is a prime.

It is a super-2 number, since 2×21424310855² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424310857) 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, 63260 + ... + 216449.

It is an arithmetic number, because the mean of its divisors is an integer number (3213867900).

Almost surely, 2^21424310855 is an apocalyptic number.

21424310855 is a deficient number, since it is larger than the sum of its proper divisors (4286632345).

21424310855 is a wasteful number, since it uses less digits than its factorization.

21424310855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295033.

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

The spelling of 21424310855 in words is "twenty-one billion, four hundred twenty-four million, three hundred ten thousand, eight hundred fifty-five".