1223020021 has 8 divisors (see below), whose sum is σ = 1227441600. Its totient is φ = 1218606240.

The previous prime is 1223020013. The next prime is 1223020031. The reversal of 1223020021 is 1200203221.

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 1223020021 - 2³ = 1223020013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1223019983 and 1223020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223020031) 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, 617010 + ... + 618988.

It is an arithmetic number, because the mean of its divisors is an integer number (153430200).

Almost surely, 2^1223020021 is an apocalyptic number.

It is an amenable number.

1223020021 is a deficient number, since it is larger than the sum of its proper divisors (4421579).

1223020021 is a wasteful number, since it uses less digits than its factorization.

1223020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1223020021 is about 34971.7031469730. The cubic root of 1223020021 is about 1069.4106927610.

Adding to 1223020021 its reverse (1200203221), we get a palindrome (2423223242).

The spelling of 1223020021 in words is "one billion, two hundred twenty-three million, twenty thousand, twenty-one".