210220212012721 has 2 divisors, whose sum is σ = 210220212012722. Its totient is φ = 210220212012720.

The previous prime is 210220212012617. The next prime is 210220212012773. The reversal of 210220212012721 is 127210212022012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209504318341696 + 715893671025 = 14474264^2 + 846105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210220212012721 is a prime.

It is not a weakly prime, because it can be changed into another prime (210220212012791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110106006360 + 105110106006361.

It is an arithmetic number, because the mean of its divisors is an integer number (105110106006361).

Almost surely, 2^{210220212012721} is an apocalyptic number.

It is an amenable number.

210220212012721 is a deficient number, since it is larger than the sum of its proper divisors (1).

210220212012721 is an equidigital number, since it uses as much as digits as its factorization.

210220212012721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 210220212012721 its reverse (127210212022012), we get a palindrome (337430424034733).

The spelling of 210220212012721 in words is "two hundred ten trillion, two hundred twenty billion, two hundred twelve million, twelve thousand, seven hundred twenty-one".