21462647238 has 24 divisors (see below), whose sum is σ = 47290581000. Its totient is φ = 7032957504.

The previous prime is 21462647201. The next prime is 21462647249. The reversal of 21462647238 is 83274626412.

It is a happy number.

21462647238 is a `hidden beast` number, since 2 + 14 + 626 + 4 + 7 + 2 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21462647193 and 21462647202.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10103763 + ... + 10105886.

It is an arithmetic number, because the mean of its divisors is an integer number (1970440875).

Almost surely, 2^21462647238 is an apocalyptic number.

21462647238 is an abundant number, since it is smaller than the sum of its proper divisors (25827933762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21462647238 is a wasteful number, since it uses less digits than its factorization.

21462647238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20209716 (or 20209713 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The spelling of 21462647238 in words is "twenty-one billion, four hundred sixty-two million, six hundred forty-seven thousand, two hundred thirty-eight".