1220213011 has 4 divisors (see below), whose sum is σ = 1243235952. Its totient is φ = 1197190072.

The previous prime is 1220213009. The next prime is 1220213053. The reversal of 1220213011 is 1103120221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220213011 - 2¹ = 1220213009 is a prime.

It is a super-2 number, since 2×1220213011² = 2977839584427372242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220212982 and 1220213000.

It is not an unprimeable number, because it can be changed into a prime (1220283011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11511391 + ... + 11511496.

It is an arithmetic number, because the mean of its divisors is an integer number (310808988).

Almost surely, 2^1220213011 is an apocalyptic number.

1220213011 is a deficient number, since it is larger than the sum of its proper divisors (23022941).

1220213011 is an equidigital number, since it uses as much as digits as its factorization.

1220213011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23022940.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1220213011 is about 34931.5475036535. The cubic root of 1220213011 is about 1068.5919146682.

Adding to 1220213011 its reverse (1103120221), we get a palindrome (2323333232).

The spelling of 1220213011 in words is "one billion, two hundred twenty million, two hundred thirteen thousand, eleven".