21646151042 has 8 divisors (see below), whose sum is σ = 32471768316. Its totient is φ = 10822228272.

The previous prime is 21646151011. The next prime is 21646151077. The reversal of 21646151042 is 24015164612.

It can be written as a sum of positive squares in 2 ways, for example, as 21609294001 + 36857041 = 147001^2 + 6071^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 391193 + ... + 443084.

Almost surely, 2^21646151042 is an apocalyptic number.

21646151042 is a deficient number, since it is larger than the sum of its proper divisors (10825617274).

21646151042 is a wasteful number, since it uses less digits than its factorization.

21646151042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847252.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21646151042 in words is "twenty-one billion, six hundred forty-six million, one hundred fifty-one thousand, forty-two".