1210210202021 has 4 divisors (see below), whose sum is σ = 1281399037452. Its totient is φ = 1139021366592.

The previous prime is 1210210202017. The next prime is 1210210202051. The reversal of 1210210202021 is 1202020120121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1089599857921 + 120610344100 = 1043839^2 + 347290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210210202021 - 2² = 1210210202017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210210201987 and 1210210202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210210202011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35594417690 + ... + 35594417723.

It is an arithmetic number, because the mean of its divisors is an integer number (320349759363).

Almost surely, 2^{1210210202021} is an apocalyptic number.

It is an amenable number.

1210210202021 is a deficient number, since it is larger than the sum of its proper divisors (71188835431).

1210210202021 is an equidigital number, since it uses as much as digits as its factorization.

1210210202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71188835430.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1210210202021 its reverse (1202020120121), we get a palindrome (2412230322142).

The spelling of 1210210202021 in words is "one trillion, two hundred ten billion, two hundred ten million, two hundred two thousand, twenty-one".