30021320261 has 2 divisors, whose sum is σ = 30021320262. Its totient is φ = 30021320260.

The previous prime is 30021320213. The next prime is 30021320281. The reversal of 30021320261 is 16202312003.

It is a happy number.

It is an a-pointer prime, because the next prime (30021320281) can be obtained adding 30021320261 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15598511236 + 14422809025 = 124894^2 + 120095^2 .

It is a cyclic number.

It is not a de Polignac number, because 30021320261 - 2¹⁴ = 30021303877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30021320281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15010660130 + 15010660131.

It is an arithmetic number, because the mean of its divisors is an integer number (15010660131).

Almost surely, 2^30021320261 is an apocalyptic number.

It is an amenable number.

30021320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

30021320261 is an equidigital number, since it uses as much as digits as its factorization.

30021320261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 30021320261 its reverse (16202312003), we get a palindrome (46223632264).

The spelling of 30021320261 in words is "thirty billion, twenty-one million, three hundred twenty thousand, two hundred sixty-one".