1220021043 has 8 divisors (see below), whose sum is σ = 1627170048. Its totient is φ = 813109704.

The previous prime is 1220021029. The next prime is 1220021059. The reversal of 1220021043 is 3401200221.

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

It is not a de Polignac number, because 1220021043 - 2⁶ = 1220020979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220021083) 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 7 ways as a sum of consecutive naturals, for example, 47071 + ... + 68232.

It is an arithmetic number, because the mean of its divisors is an integer number (203396256).

Almost surely, 2^1220021043 is an apocalyptic number.

1220021043 is a deficient number, since it is larger than the sum of its proper divisors (407149005).

1220021043 is a wasteful number, since it uses less digits than its factorization.

1220021043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118833.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1220021043 is about 34928.7996215158. The cubic root of 1220021043 is about 1068.5358735756.

Adding to 1220021043 its reverse (3401200221), we get a palindrome (4621221264).

The spelling of 1220021043 in words is "one billion, two hundred twenty million, twenty-one thousand, forty-three".