21384938151 has 12 divisors (see below), whose sum is σ = 30936236760. Its totient is φ = 14234987760.

The previous prime is 21384938123. The next prime is 21384938189. The reversal of 21384938151 is 15183948312.

21384938151 is a `hidden beast` number, since 2 + 1 + 3 + 8 + 493 + 8 + 151 = 666.

It is not a de Polignac number, because 21384938151 - 2⁶ = 21384938087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21384938097 and 21384938106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21384938051) 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 11 ways as a sum of consecutive naturals, for example, 1796880 + ... + 1808741.

It is an arithmetic number, because the mean of its divisors is an integer number (2578019730).

Almost surely, 2^21384938151 is an apocalyptic number.

21384938151 is a deficient number, since it is larger than the sum of its proper divisors (9551298609).

21384938151 is a wasteful number, since it uses less digits than its factorization.

21384938151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3606286 (or 3606283 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 21384938151 in words is "twenty-one billion, three hundred eighty-four million, nine hundred thirty-eight thousand, one hundred fifty-one".