30215222221 has 4 divisors (see below), whose sum is σ = 31992588252. Its totient is φ = 28437856192.

The previous prime is 30215222209. The next prime is 30215222227. The reversal of 30215222221 is 12222251203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12222251203 = 16057 ⋅761179.

It can be written as a sum of positive squares in 2 ways, for example, as 13575512196 + 16639710025 = 116514^2 + 128995^2 .

It is a cyclic number.

It is not a de Polignac number, because 30215222221 - 2⁵ = 30215222189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30215222192 and 30215222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30215222227) 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, 888682990 + ... + 888683023.

It is an arithmetic number, because the mean of its divisors is an integer number (7998147063).

Almost surely, 2^30215222221 is an apocalyptic number.

It is an amenable number.

30215222221 is a deficient number, since it is larger than the sum of its proper divisors (1777366031).

30215222221 is a wasteful number, since it uses less digits than its factorization.

30215222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777366030.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 30215222221 its reverse (12222251203), we get a palindrome (42437473424).

The spelling of 30215222221 in words is "thirty billion, two hundred fifteen million, two hundred twenty-two thousand, two hundred twenty-one".