1213221023 has 4 divisors (see below), whose sum is σ = 1386538320. Its totient is φ = 1039903728.

The previous prime is 1213221017. The next prime is 1213221029. The reversal of 1213221023 is 3201223121.

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

It is an interprime number because it is at equal distance from previous prime (1213221017) and next prime (1213221029).

It is a cyclic number.

It is not a de Polignac number, because 1213221023 - 2⁴ = 1213221007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213220992 and 1213221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221029) 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, 86658638 + ... + 86658651.

It is an arithmetic number, because the mean of its divisors is an integer number (346634580).

Almost surely, 2^1213221023 is an apocalyptic number.

1213221023 is a deficient number, since it is larger than the sum of its proper divisors (173317297).

1213221023 is an equidigital number, since it uses as much as digits as its factorization.

1213221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173317296.

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

The square root of 1213221023 is about 34831.3224411592. The cubic root of 1213221023 is about 1066.5469442560.

Adding to 1213221023 its reverse (3201223121), we get a palindrome (4414444144).

The spelling of 1213221023 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-three".