1202221000021 has 4 divisors (see below), whose sum is σ = 1222597627200. Its totient is φ = 1181844372844.

The previous prime is 1202220999961. The next prime is 1202221000039. The reversal of 1202221000021 is 1200001222021.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1202221000021 - 2⁹ = 1202220999509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202220999965 and 1202221000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202221000081) 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 3 ways as a sum of consecutive naturals, for example, 10188313501 + ... + 10188313618.

It is an arithmetic number, because the mean of its divisors is an integer number (305649406800).

Almost surely, 2^{1202221000021} is an apocalyptic number.

It is an amenable number.

1202221000021 is a deficient number, since it is larger than the sum of its proper divisors (20376627179).

1202221000021 is an equidigital number, since it uses as much as digits as its factorization.

1202221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20376627178.

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

Adding to 1202221000021 its reverse (1200001222021), we get a palindrome (2402222222042).

The spelling of 1202221000021 in words is "one trillion, two hundred two billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.