1202001220021 has 16 divisors (see below), whose sum is σ = 1413184190976. Its totient is φ = 1001005393536.

The previous prime is 1202001220019. The next prime is 1202001220051. The reversal of 1202001220021 is 1200221002021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1202001220021 - 2¹ = 1202001220019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202001219983 and 1202001220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202001220051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13288866 + ... + 13379011.

It is an arithmetic number, because the mean of its divisors is an integer number (88324011936).

Almost surely, 2^{1202001220021} is an apocalyptic number.

It is an amenable number.

1202001220021 is a deficient number, since it is larger than the sum of its proper divisors (211182970955).

1202001220021 is a wasteful number, since it uses less digits than its factorization.

1202001220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26668068.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1202001220021 its reverse (1200221002021), we get a palindrome (2402222222042).

The spelling of 1202001220021 in words is "one trillion, two hundred two billion, one million, two hundred twenty thousand, twenty-one".