1202020100021 has 8 divisors (see below), whose sum is σ = 1296534672384. Its totient is φ = 1107798597360.

The previous prime is 1202020100011. The next prime is 1202020100033. The reversal of 1202020100021 is 1200010202021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1202020100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202020099975 and 1202020100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202020100011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73258901 + ... + 73275306.

It is an arithmetic number, because the mean of its divisors is an integer number (162066834048).

Almost surely, 2^{1202020100021} is an apocalyptic number.

It is an amenable number.

1202020100021 is a deficient number, since it is larger than the sum of its proper divisors (94514572363).

1202020100021 is a wasteful number, since it uses less digits than its factorization.

1202020100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146534851.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1202020100021 its reverse (1200010202021), we get a palindrome (2402030302042).

The spelling of 1202020100021 in words is "one trillion, two hundred two billion, twenty million, one hundred thousand, twenty-one".