1321220229 has 32 divisors (see below), whose sum is σ = 2134169856. Its totient is φ = 709754880.

The previous prime is 1321220227. The next prime is 1321220249. The reversal of 1321220229 is 9220221231.

It is not a de Polignac number, because 1321220229 - 2¹ = 1321220227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321220199 and 1321220208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321220227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 432949 + ... + 435989.

It is an arithmetic number, because the mean of its divisors is an integer number (66692808).

Almost surely, 2^1321220229 is an apocalyptic number.

It is an amenable number.

1321220229 is a deficient number, since it is larger than the sum of its proper divisors (812949627).

1321220229 is a wasteful number, since it uses less digits than its factorization.

1321220229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1321220229 is about 36348.5932189954. The cubic root of 1321220229 is about 1097.2992225465.

The spelling of 1321220229 in words is "one billion, three hundred twenty-one million, two hundred twenty thousand, two hundred twenty-nine".