1220021011 has 8 divisors (see below), whose sum is σ = 1333492848. Its totient is φ = 1106976000.

The previous prime is 1220021009. The next prime is 1220021029. The reversal of 1220021011 is 1101200221.

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 1220021011 - 2¹ = 1220021009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220021071) 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, 100710 + ... + 112171.

It is an arithmetic number, because the mean of its divisors is an integer number (166686606).

Almost surely, 2^1220021011 is an apocalyptic number.

1220021011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220021011 is a deficient number, since it is larger than the sum of its proper divisors (113471837).

1220021011 is a wasteful number, since it uses less digits than its factorization.

1220021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213413.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1220021011 is about 34928.7991634410. The cubic root of 1220021011 is about 1068.5358642334.

Adding to 1220021011 its reverse (1101200221), we get a palindrome (2321221232).

It can be divided in two parts, 12200210 and 11, that added together give a palindrome (12200221).

The spelling of 1220021011 in words is "one billion, two hundred twenty million, twenty-one thousand, eleven".