21049981708082 has 16 divisors (see below), whose sum is σ = 32345326894104. Its totient is φ = 10268209776000.

The previous prime is 21049981708013. The next prime is 21049981708099. The reversal of 21049981708082 is 28080718994012.

It can be written as a sum of positive squares in 4 ways, for example, as 20592817760761 + 457163947321 = 4537931^2 + 676139^2 .

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, 11544332 + ... + 13242792.

Almost surely, 2^{21049981708082} is an apocalyptic number.

21049981708082 is a deficient number, since it is larger than the sum of its proper divisors (11295345186022).

21049981708082 is a wasteful number, since it uses less digits than its factorization.

21049981708082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849645.

The product of its (nonzero) digits is 4644864, while the sum is 59.

The spelling of 21049981708082 in words is "twenty-one trillion, forty-nine billion, nine hundred eighty-one million, seven hundred eight thousand, eighty-two".