1002220121 has 8 divisors (see below), whose sum is σ = 1145612160. Its totient is φ = 858882528.

The previous prime is 1002220117. The next prime is 1002220129. The reversal of 1002220121 is 1210222001.

It is a happy number.

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

It is not a de Polignac number, because 1002220121 - 2² = 1002220117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1002220129) 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, 39845 + ... + 59933.

It is an arithmetic number, because the mean of its divisors is an integer number (143201520).

Almost surely, 2^1002220121 is an apocalyptic number.

It is an amenable number.

1002220121 is a deficient number, since it is larger than the sum of its proper divisors (143392039).

1002220121 is an equidigital number, since it uses as much as digits as its factorization.

1002220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27223.

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

The square root of 1002220121 is about 31657.8603351522. The cubic root of 1002220121 is about 1000.7394933481.

Adding to 1002220121 its reverse (1210222001), we get a palindrome (2212442122).

The spelling of 1002220121 in words is "one billion, two million, two hundred twenty thousand, one hundred twenty-one".