7002121221 has 20 divisors (see below), whose sum is σ = 10468048800. Its totient is φ = 4664470536.

The previous prime is 7002121183. The next prime is 7002121229. The reversal of 7002121221 is 1221212007.

It is a happy number.

It is not a de Polignac number, because 7002121221 - 2⁹ = 7002120709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7002121194 and 7002121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7002121229) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74070 + ... + 139608.

It is an arithmetic number, because the mean of its divisors is an integer number (523402440).

Almost surely, 2^7002121221 is an apocalyptic number.

It is an amenable number.

7002121221 is a deficient number, since it is larger than the sum of its proper divisors (3465927579).

7002121221 is a wasteful number, since it uses less digits than its factorization.

7002121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66870 (or 66861 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 7002121221 is about 83678.6784133210. The cubic root of 7002121221 is about 1913.1243894386.

Adding to 7002121221 its reverse (1221212007), we get a palindrome (8223333228).

The spelling of 7002121221 in words is "seven billion, two million, one hundred twenty-one thousand, two hundred twenty-one".