1210102020021 has 4 divisors (see below), whose sum is σ = 1613469360032. Its totient is φ = 806734680012.

The previous prime is 1210102019989. The next prime is 1210102020041. The reversal of 1210102020021 is 1200202010121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1210102020021 - 2⁵ = 1210102019989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210102019979 and 1210102020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210102020041) 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, 201683670001 + ... + 201683670006.

It is an arithmetic number, because the mean of its divisors is an integer number (403367340008).

Almost surely, 2^{1210102020021} is an apocalyptic number.

It is an amenable number.

1210102020021 is a deficient number, since it is larger than the sum of its proper divisors (403367340011).

1210102020021 is an equidigital number, since it uses as much as digits as its factorization.

1210102020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403367340010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210102020021 its reverse (1200202010121), we get a palindrome (2410304030142).

The spelling of 1210102020021 in words is "one trillion, two hundred ten billion, one hundred two million, twenty thousand, twenty-one".