21110111020210 has 16 divisors (see below), whose sum is σ = 38042746393176. Its totient is φ = 8434145173248.

The previous prime is 21110111020151. The next prime is 21110111020237. The reversal of 21110111020210 is 1202011101112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14543750895129 + 6566360125081 = 3813627^2 + 2562491^2 .

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, 1237395399 + ... + 1237412458.

Almost surely, 2^{21110111020210} is an apocalyptic number.

21110111020210 is a deficient number, since it is larger than the sum of its proper divisors (16932635372966).

21110111020210 is a wasteful number, since it uses less digits than its factorization.

21110111020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474808717.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21110111020210 its reverse (1202011101112), we get a palindrome (22312122121322).

The spelling of 21110111020210 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, twenty thousand, two hundred ten".