1202021210021 has 4 divisors (see below), whose sum is σ = 1202026131852. Its totient is φ = 1202016288192.

The previous prime is 1202021209981. The next prime is 1202021210041. The reversal of 1202021210021 is 1200121202021.

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 1141756360900 + 60264849121 = 1068530^2 + 245489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1202021210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202021209978 and 1202021210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202021210041) 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, 2074340 + ... + 2589773.

It is an arithmetic number, because the mean of its divisors is an integer number (300506532963).

Almost surely, 2^{1202021210021} is an apocalyptic number.

It is an amenable number.

1202021210021 is a deficient number, since it is larger than the sum of its proper divisors (4921831).

1202021210021 is an equidigital number, since it uses as much as digits as its factorization.

1202021210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4921830.

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

Adding to 1202021210021 its reverse (1200121202021), we get a palindrome (2402142412042).

The spelling of 1202021210021 in words is "one trillion, two hundred two billion, twenty-one million, two hundred ten thousand, twenty-one".