1000120221021 has 4 divisors (see below), whose sum is σ = 1333493628032. Its totient is φ = 666746814012.

The previous prime is 1000120221019. The next prime is 1000120221031. The reversal of 1000120221021 is 1201220210001.

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 not a de Polignac number, because 1000120221021 - 2¹ = 1000120221019 is a prime.

It is a super-5 number, since 5×1000120221021⁵ (a number of 61 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000120220988 and 1000120221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000120221031) 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, 166686703501 + ... + 166686703506.

It is an arithmetic number, because the mean of its divisors is an integer number (333373407008).

Almost surely, 2^{1000120221021} is an apocalyptic number.

It is an amenable number.

1000120221021 is a deficient number, since it is larger than the sum of its proper divisors (333373407011).

1000120221021 is an equidigital number, since it uses as much as digits as its factorization.

1000120221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333373407010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1000120221021 its reverse (1201220210001), we get a palindrome (2201340431022).

It can be divided in two parts, 1000 and 120221021, that added together give a palindrome (120222021).

The spelling of 1000120221021 in words is "one trillion, one hundred twenty million, two hundred twenty-one thousand, twenty-one".