1220213005 has 12 divisors (see below), whose sum is σ = 1609471836. Its totient is φ = 887427200.

The previous prime is 1220212999. The next prime is 1220213009. The reversal of 1220213005 is 5003120221.

It can be written as a sum of positive squares in 2 ways, for example, as 646227241 + 573985764 = 25421^2 + 23958^2 .

It is not a de Polignac number, because 1220213005 - 2⁹ = 1220212493 is a prime.

It is a super-2 number, since 2×1220213005² = 2977839555142260050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220213005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220213009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1007836 + ... + 1009045.

It is an arithmetic number, because the mean of its divisors is an integer number (134122653).

Almost surely, 2^1220213005 is an apocalyptic number.

It is an amenable number.

1220213005 is a deficient number, since it is larger than the sum of its proper divisors (389258831).

1220213005 is a wasteful number, since it uses less digits than its factorization.

1220213005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016908 (or 2016897 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1220213005 is about 34931.5474177712. The cubic root of 1220213005 is about 1068.5919129168.

Adding to 1220213005 its reverse (5003120221), we get a palindrome (6223333226).

The spelling of 1220213005 in words is "one billion, two hundred twenty million, two hundred thirteen thousand, five".