21385003874 has 16 divisors (see below), whose sum is σ = 35111320440. Its totient is φ = 9708197760.

The previous prime is 21385003859. The next prime is 21385003957. The reversal of 21385003874 is 47830058312.

It can be written as a sum of positive squares in 4 ways, for example, as 16492980625 + 4892023249 = 128425^2 + 69943^2 .

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 7 ways as a sum of consecutive naturals, for example, 6740219 + ... + 6743390.

Almost surely, 2^21385003874 is an apocalyptic number.

21385003874 is a deficient number, since it is larger than the sum of its proper divisors (13726316566).

21385003874 is a wasteful number, since it uses less digits than its factorization.

21385003874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13483685.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 21385003874 in words is "twenty-one billion, three hundred eighty-five million, three thousand, eight hundred seventy-four".