1122151721 has 2 divisors, whose sum is σ = 1122151722. Its totient is φ = 1122151720.

The previous prime is 1122151717. The next prime is 1122151727. The reversal of 1122151721 is 1271512211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1097994496 + 24157225 = 33136^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122151721 - 2² = 1122151717 is a prime.

It is not a weakly prime, because it can be changed into another prime (1122151727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561075860 + 561075861.

It is an arithmetic number, because the mean of its divisors is an integer number (561075861).

Almost surely, 2^1122151721 is an apocalyptic number.

It is an amenable number.

1122151721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122151721 is an equidigital number, since it uses as much as digits as its factorization.

1122151721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 23.

The square root of 1122151721 is about 33498.5331171381. The cubic root of 1122151721 is about 1039.1634424681.

Adding to 1122151721 its reverse (1271512211), we get a palindrome (2393663932).

The spelling of 1122151721 in words is "one billion, one hundred twenty-two million, one hundred fifty-one thousand, seven hundred twenty-one".