30002121221 has 4 divisors (see below), whose sum is σ = 30015680652. Its totient is φ = 29988561792.

The previous prime is 30002121199. The next prime is 30002121223. The reversal of 30002121221 is 12212120003.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15598761025 + 14403360196 = 124895^2 + 120014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30002121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30002121196 and 30002121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30002121223) 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, 6776396 + ... + 6780821.

It is an arithmetic number, because the mean of its divisors is an integer number (7503920163).

Almost surely, 2^30002121221 is an apocalyptic number.

It is an amenable number.

30002121221 is a deficient number, since it is larger than the sum of its proper divisors (13559431).

30002121221 is a wasteful number, since it uses less digits than its factorization.

30002121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559430.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 30002121221 its reverse (12212120003), we get a palindrome (42214241224).

The spelling of 30002121221 in words is "thirty billion, two million, one hundred twenty-one thousand, two hundred twenty-one".