21606121061626 has 8 divisors (see below), whose sum is σ = 32457053354580. Its totient is φ = 10787103276768.

The previous prime is 21606121061621. The next prime is 21606121061653. The reversal of 21606121061626 is 62616012160612.

It can be written as a sum of positive squares in 2 ways, for example, as 20918722542601 + 687398519025 = 4573699^2 + 829095^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21606121061621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7978625331 + ... + 7978628038.

Almost surely, 2^{21606121061626} is an apocalyptic number.

21606121061626 is a deficient number, since it is larger than the sum of its proper divisors (10850932292954).

21606121061626 is a wasteful number, since it uses less digits than its factorization.

21606121061626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15957254048.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21606121061626 in words is "twenty-one trillion, six hundred six billion, one hundred twenty-one million, sixty-one thousand, six hundred twenty-six".