10451111221 has 2 divisors, whose sum is σ = 10451111222. Its totient is φ = 10451111220.

The previous prime is 10451111219. The next prime is 10451111309. The reversal of 10451111221 is 12211115401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8771259025 + 1679852196 = 93655^2 + 40986^2 .

It is a cyclic number.

It is not a de Polignac number, because 10451111221 - 2¹ = 10451111219 is a prime.

It is a super-2 number, since 2×10451111221² (a number of 21 digits) contains 22 as substring.

Together with 10451111219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10451111821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5225555610 + 5225555611.

It is an arithmetic number, because the mean of its divisors is an integer number (5225555611).

Almost surely, 2^10451111221 is an apocalyptic number.

It is an amenable number.

10451111221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10451111221 is an equidigital number, since it uses as much as digits as its factorization.

10451111221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 10451111221 its reverse (12211115401), we get a palindrome (22662226622).

The spelling of 10451111221 in words is "ten billion, four hundred fifty-one million, one hundred eleven thousand, two hundred twenty-one".