1210111010021 has 12 divisors (see below), whose sum is σ = 1277435659500. Its totient is φ = 1146167385408.

The previous prime is 1210111010011. The next prime is 1210111010063. The reversal of 1210111010021 is 1200101110121.

It can be written as a sum of positive squares in 2 ways, for example, as 443109892225 + 767001117796 = 665665^2 + 875786^2 .

It is not a de Polignac number, because 1210111010021 - 2⁶ = 1210111009957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210111009984 and 1210111010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111010011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1273745 + ... + 2010633.

It is an arithmetic number, because the mean of its divisors is an integer number (106452971625).

Almost surely, 2^{1210111010021} is an apocalyptic number.

It is an amenable number.

1210111010021 is a deficient number, since it is larger than the sum of its proper divisors (67324649479).

1210111010021 is an equidigital number, since it uses as much as digits as its factorization.

1210111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741476 (or 741457 counting only the distinct ones).

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

Adding to 1210111010021 its reverse (1200101110121), we get a palindrome (2410212120142).

It can be divided in two parts, 12101110100 and 21, that added together give a palindrome (12101110121).

The spelling of 1210111010021 in words is "one trillion, two hundred ten billion, one hundred eleven million, ten thousand, twenty-one".