1220213231 has 8 divisors (see below), whose sum is σ = 1287369600. Its totient is φ = 1153350360.

The previous prime is 1220213209. The next prime is 1220213249. The reversal of 1220213231 is 1323120221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220213231 - 2⁶ = 1220213167 is a prime.

It is a super-2 number, since 2×1220213231² = 2977840658214918722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220213261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64805 + ... + 81486.

It is an arithmetic number, because the mean of its divisors is an integer number (160921200).

Almost surely, 2^1220213231 is an apocalyptic number.

1220213231 is a deficient number, since it is larger than the sum of its proper divisors (67156369).

1220213231 is a wasteful number, since it uses less digits than its factorization.

1220213231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146749.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1220213231 is about 34931.5506526693. The cubic root of 1220213231 is about 1068.5919788893.

Adding to 1220213231 its reverse (1323120221), we get a palindrome (2543333452).

The spelling of 1220213231 in words is "one billion, two hundred twenty million, two hundred thirteen thousand, two hundred thirty-one".