21077384138 has 8 divisors (see below), whose sum is σ = 32990688288. Its totient is φ = 10080488044.

The previous prime is 21077384137. The next prime is 21077384177. The reversal of 21077384138 is 83148377012.

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

It is a super-2 number, since 2×21077384138² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21077384131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229101956 + ... + 229102047.

It is an arithmetic number, because the mean of its divisors is an integer number (4123836036).

Almost surely, 2^21077384138 is an apocalyptic number.

21077384138 is a deficient number, since it is larger than the sum of its proper divisors (11913304150).

21077384138 is a wasteful number, since it uses less digits than its factorization.

21077384138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458204028.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 21077384138 in words is "twenty-one billion, seventy-seven million, three hundred eighty-four thousand, one hundred thirty-eight".