1222321551 has 24 divisors (see below), whose sum is σ = 1853179440. Its totient is φ = 715249920.

The previous prime is 1222321511. The next prime is 1222321567. The reversal of 1222321551 is 1551232221.

1222321551 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1222321551 - 2¹⁴ = 1222305167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222321511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47530 + ... + 68583.

It is an arithmetic number, because the mean of its divisors is an integer number (77215810).

Almost surely, 2^1222321551 is an apocalyptic number.

1222321551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1222321551 is a deficient number, since it is larger than the sum of its proper divisors (630857889).

1222321551 is a wasteful number, since it uses less digits than its factorization.

1222321551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116167 (or 116156 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 1222321551 is about 34961.7155042484. The cubic root of 1222321551 is about 1069.2070728926.

Adding to 1222321551 its reverse (1551232221), we get a palindrome (2773553772).

The spelling of 1222321551 in words is "one billion, two hundred twenty-two million, three hundred twenty-one thousand, five hundred fifty-one".