20121021110002 has 16 divisors (see below), whose sum is σ = 31734114701400. Its totient is φ = 9554357111040.

The previous prime is 20121021109961. The next prime is 20121021110023. The reversal of 20121021110002 is 20001112012102.

It can be written as a sum of positive squares in 4 ways, for example, as 15257765642161 + 4863255467841 = 3906119^2 + 2205279^2 .

It is a super-2 number, since 2×20121021110002² (a number of 27 digits) contains 22 as substring.

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, 2843555127 + ... + 2843562202.

Almost surely, 2^{20121021110002} is an apocalyptic number.

20121021110002 is a deficient number, since it is larger than the sum of its proper divisors (11613093591398).

20121021110002 is a wasteful number, since it uses less digits than its factorization.

20121021110002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5687117421.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20121021110002 its reverse (20001112012102), we get a palindrome (40122133122104).

The spelling of 20121021110002 in words is "twenty trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, two".