1221303011 has 8 divisors (see below), whose sum is σ = 1225202784. Its totient is φ = 1217410560.

The previous prime is 1221302981. The next prime is 1221303049. The reversal of 1221303011 is 1103031221.

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 1221303011 - 2¹⁸ = 1221040867 is a prime.

It is a super-2 number, since 2×1221303011² = 2983162089355332242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221323011) 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, 593861 + ... + 595913.

It is an arithmetic number, because the mean of its divisors is an integer number (153150348).

Almost surely, 2^1221303011 is an apocalyptic number.

1221303011 is a deficient number, since it is larger than the sum of its proper divisors (3899773).

1221303011 is a wasteful number, since it uses less digits than its factorization.

1221303011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221303011 is about 34947.1459635833. The cubic root of 1221303011 is about 1068.9100062707.

Adding to 1221303011 its reverse (1103031221), we get a palindrome (2324334232).

The spelling of 1221303011 in words is "one billion, two hundred twenty-one million, three hundred three thousand, eleven".