1220212021 has 8 divisors (see below), whose sum is σ = 1394762240. Its totient is φ = 1045720368.

The previous prime is 1220212013. The next prime is 1220212027. The reversal of 1220212021 is 1202120221.

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 1220212021 - 2³ = 1220212013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220211992 and 1220212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220212027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47740 + ... + 68698.

It is an arithmetic number, because the mean of its divisors is an integer number (174345280).

Almost surely, 2^1220212021 is an apocalyptic number.

It is an amenable number.

1220212021 is a deficient number, since it is larger than the sum of its proper divisors (174550219).

1220212021 is an equidigital number, since it uses as much as digits as its factorization.

1220212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29283.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1220212021 is about 34931.5333330789. The cubic root of 1220212021 is about 1068.5916256733.

Adding to 1220212021 its reverse (1202120221), we get a palindrome (2422332242).

It can be divided in two parts, 1 and 220212021, that added together give a palindrome (220212022).

The spelling of 1220212021 in words is "one billion, two hundred twenty million, two hundred twelve thousand, twenty-one".