1202120210021 has 4 divisors (see below), whose sum is σ = 1240898281344. Its totient is φ = 1163342138700.

The previous prime is 1202120209991. The next prime is 1202120210051. The reversal of 1202120210021 is 1200120212021.

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 an interprime number because it is at equal distance from previous prime (1202120209991) and next prime (1202120210051).

It is a cyclic number.

It is not a de Polignac number, because 1202120210021 - 2¹⁰ = 1202120208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202120209978 and 1202120210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202120210051) 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, 19389035615 + ... + 19389035676.

It is an arithmetic number, because the mean of its divisors is an integer number (310224570336).

Almost surely, 2^{1202120210021} is an apocalyptic number.

It is an amenable number.

1202120210021 is a deficient number, since it is larger than the sum of its proper divisors (38778071323).

1202120210021 is an equidigital number, since it uses as much as digits as its factorization.

1202120210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38778071322.

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

Adding to 1202120210021 its reverse (1200120212021), we get a palindrome (2402240422042).

It can be divided in two parts, 1202120 and 210021, that added together give a palindrome (1412141).

The spelling of 1202120210021 in words is "one trillion, two hundred two billion, one hundred twenty million, two hundred ten thousand, twenty-one".