10120220212721 has 2 divisors, whose sum is σ = 10120220212722. Its totient is φ = 10120220212720.

The previous prime is 10120220212693. The next prime is 10120220212723. The reversal of 10120220212721 is 12721202202101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9962103438400 + 158116774321 = 3156280^2 + 397639^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120220212721 - 2⁶ = 10120220212657 is a prime.

Together with 10120220212723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10120220212723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060110106360 + 5060110106361.

It is an arithmetic number, because the mean of its divisors is an integer number (5060110106361).

Almost surely, 2^{10120220212721} is an apocalyptic number.

It is an amenable number.

10120220212721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10120220212721 is an equidigital number, since it uses as much as digits as its factorization.

10120220212721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 10120220212721 its reverse (12721202202101), we get a palindrome (22841422414822).

The spelling of 10120220212721 in words is "ten trillion, one hundred twenty billion, two hundred twenty million, two hundred twelve thousand, seven hundred twenty-one".