21001211110010 has 16 divisors (see below), whose sum is σ = 37803188274696. Its totient is φ = 8400260382528.

The previous prime is 21001211109997. The next prime is 21001211110049. The reversal of 21001211110010 is 1001111210012.

It can be written as a sum of positive squares in 4 ways, for example, as 12433021550401 + 8568189559609 = 3526049^2 + 2927147^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21001211109973 and 21001211110000.

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, 27613757 + ... + 28364096.

Almost surely, 2^{21001211110010} is an apocalyptic number.

21001211110010 is a deficient number, since it is larger than the sum of its proper divisors (16801977164686).

21001211110010 is a wasteful number, since it uses less digits than its factorization.

21001211110010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56015377.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21001211110010 its reverse (1001111210012), we get a palindrome (22002322320022).

The spelling of 21001211110010 in words is "twenty-one trillion, one billion, two hundred eleven million, one hundred ten thousand, ten".