21760990546 has 4 divisors (see below), whose sum is σ = 32641485822. Its totient is φ = 10880495272.

The previous prime is 21760990519. The next prime is 21760990549. The reversal of 21760990546 is 64509906712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12311012025 + 9449978521 = 110955^2 + 97211^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21760990546.

It is not an unprimeable number, because it can be changed into a prime (21760990549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5440247635 + ... + 5440247638.

Almost surely, 2^21760990546 is an apocalyptic number.

21760990546 is a deficient number, since it is larger than the sum of its proper divisors (10880495276).

21760990546 is a wasteful number, since it uses less digits than its factorization.

21760990546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880495275.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 21760990546 in words is "twenty-one billion, seven hundred sixty million, nine hundred ninety thousand, five hundred forty-six".