21642824612 has 6 divisors (see below), whose sum is σ = 37874943078. Its totient is φ = 10821412304.

The previous prime is 21642824597. The next prime is 21642824639.

21642824612 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 11256361216 + 10386463396 = 106096^2 + 101914^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2705353073 + ... + 2705353080.

It is an arithmetic number, because the mean of its divisors is an integer number (6312490513).

Almost surely, 2^21642824612 is an apocalyptic number.

It is an amenable number.

21642824612 is a deficient number, since it is larger than the sum of its proper divisors (16232118466).

21642824612 is a wasteful number, since it uses less digits than its factorization.

21642824612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5410706157 (or 5410706155 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The spelling of 21642824612 in words is "twenty-one billion, six hundred forty-two million, eight hundred twenty-four thousand, six hundred twelve".