20961847284922 has 16 divisors (see below), whose sum is σ = 32305612799880. Its totient is φ = 10193538408768.

The previous prime is 20961847284907. The next prime is 20961847285003. The reversal of 20961847284922 is 22948274816902.

It is a Cunningham number, because it is equal to 4578411²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 18756946003041 + 2204901281881 = 4330929^2 + 1484891^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56996397 + ... + 57362992.

Almost surely, 2^{20961847284922} is an apocalyptic number.

20961847284922 is a deficient number, since it is larger than the sum of its proper divisors (11343765514958).

20961847284922 is a wasteful number, since it uses less digits than its factorization.

20961847284922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114361905.

The product of its (nonzero) digits is 55738368, while the sum is 64.

The spelling of 20961847284922 in words is "twenty trillion, nine hundred sixty-one billion, eight hundred forty-seven million, two hundred eighty-four thousand, nine hundred twenty-two".