1221201023 has 8 divisors (see below), whose sum is σ = 1395986592. Its totient is φ = 1046497536.

The previous prime is 1221201019. The next prime is 1221201083. The reversal of 1221201023 is 3201021221.

It is a happy number.

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

It is not a de Polignac number, because 1221201023 - 2² = 1221201019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221200989 and 1221201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201083) 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, 15611 + ... + 51827.

It is an arithmetic number, because the mean of its divisors is an integer number (174498324).

Almost surely, 2^1221201023 is an apocalyptic number.

1221201023 is a deficient number, since it is larger than the sum of its proper divisors (174785569).

1221201023 is an equidigital number, since it uses as much as digits as its factorization.

1221201023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1221201023 is about 34945.6867581680. The cubic root of 1221201023 is about 1068.8802514303.

Adding to 1221201023 its reverse (3201021221), we get a palindrome (4422222244).

The spelling of 1221201023 in words is "one billion, two hundred twenty-one million, two hundred one thousand, twenty-three".