21976377506 has 8 divisors (see below), whose sum is σ = 33108517020. Its totient is φ = 10940205168.

The previous prime is 21976377503. The next prime is 21976377541. The reversal of 21976377506 is 60577367912.

It can be written as a sum of positive squares in 2 ways, for example, as 15477599281 + 6498778225 = 124409^2 + 80615^2 .

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

It is a super-2 number, since 2×21976377506² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21976377503) 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 3 ways as a sum of consecutive naturals, for example, 23991221 + ... + 23992136.

Almost surely, 2^21976377506 is an apocalyptic number.

21976377506 is a deficient number, since it is larger than the sum of its proper divisors (11132139514).

21976377506 is a wasteful number, since it uses less digits than its factorization.

21976377506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47983588.

The product of its (nonzero) digits is 3333960, while the sum is 53.

The spelling of 21976377506 in words is "twenty-one billion, nine hundred seventy-six million, three hundred seventy-seven thousand, five hundred six".