1221022011 has 24 divisors (see below), whose sum is σ = 1798585600. Its totient is φ = 736251120.

The previous prime is 1221021931. The next prime is 1221022013. The reversal of 1221022011 is 1102201221.

It is not a de Polignac number, because 1221022011 - 2¹³ = 1221013819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221022013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63786 + ... + 80688.

Almost surely, 2^1221022011 is an apocalyptic number.

1221022011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221022011 is a deficient number, since it is larger than the sum of its proper divisors (577563589).

1221022011 is a wasteful number, since it uses less digits than its factorization.

1221022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17127 (or 17116 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221022011 is about 34943.1253753868. The cubic root of 1221022011 is about 1068.8280209517.

Adding to 1221022011 its reverse (1102201221), we get a palindrome (2323223232).

The spelling of 1221022011 in words is "one billion, two hundred twenty-one million, twenty-two thousand, eleven".