1220151321 has 12 divisors (see below), whose sum is σ = 1767247872. Its totient is φ = 811215576.

The previous prime is 1220151301. The next prime is 1220151343. The reversal of 1220151321 is 1231510221.

It is not a de Polignac number, because 1220151321 - 2²¹ = 1218054169 is a prime.

It is a super-2 number, since 2×1220151321² = 2977538492276090082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220151294 and 1220151303.

It is not an unprimeable number, because it can be changed into a prime (1220151301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181401 + ... + 188006.

It is an arithmetic number, because the mean of its divisors is an integer number (147270656).

Almost surely, 2^1220151321 is an apocalyptic number.

It is an amenable number.

1220151321 is a deficient number, since it is larger than the sum of its proper divisors (547096551).

1220151321 is a wasteful number, since it uses less digits than its factorization.

1220151321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369780 (or 369777 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1220151321 is about 34930.6644797948. The cubic root of 1220151321 is about 1068.5739061879.

Adding to 1220151321 its reverse (1231510221), we get a palindrome (2451661542).

The spelling of 1220151321 in words is "one billion, two hundred twenty million, one hundred fifty-one thousand, three hundred twenty-one".