1220310021 has 16 divisors (see below), whose sum is σ = 1899085824. Its totient is φ = 682482864.

The previous prime is 1220309983. The next prime is 1220310023. The reversal of 1220310021 is 1200130221.

It is not a de Polignac number, because 1220310021 - 2⁹ = 1220309509 is a prime.

It is a super-4 number, since 4×1220310021⁴ (a number of 37 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220309979 and 1220310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220310023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617205 + ... + 619178.

It is an arithmetic number, because the mean of its divisors is an integer number (118692864).

Almost surely, 2^1220310021 is an apocalyptic number.

It is an amenable number.

1220310021 is a deficient number, since it is larger than the sum of its proper divisors (678775803).

1220310021 is a wasteful number, since it uses less digits than its factorization.

1220310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236440.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220310021 is about 34932.9360489496. The cubic root of 1220310021 is about 1068.6202324984.

Adding to 1220310021 its reverse (1200130221), we get a palindrome (2420440242).

The spelling of 1220310021 in words is "one billion, two hundred twenty million, three hundred ten thousand, twenty-one".