1210420403021 has 2 divisors, whose sum is σ = 1210420403022. Its totient is φ = 1210420403020.

The previous prime is 1210420403011. The next prime is 1210420403029. The reversal of 1210420403021 is 1203040240121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644149102921 + 566271300100 = 802589^2 + 752510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210420403021 - 2⁶ = 1210420402957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210420402984 and 1210420403002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210420403029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605210201510 + 605210201511.

It is an arithmetic number, because the mean of its divisors is an integer number (605210201511).

Almost surely, 2^{1210420403021} is an apocalyptic number.

It is an amenable number.

1210420403021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210420403021 is an equidigital number, since it uses as much as digits as its factorization.

1210420403021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1210420403021 its reverse (1203040240121), we get a palindrome (2413460643142).

The spelling of 1210420403021 in words is "one trillion, two hundred ten billion, four hundred twenty million, four hundred three thousand, twenty-one".