1221434011 has 8 divisors (see below), whose sum is σ = 1396138464. Its totient is φ = 1046783040.

The previous prime is 1221433949. The next prime is 1221434033. The reversal of 1221434011 is 1104341221.

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 1221434011 - 2¹⁵ = 1221401243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221434011.

It is not an unprimeable number, because it can be changed into a prime (1221434111) 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, 71541 + ... + 86953.

It is an arithmetic number, because the mean of its divisors is an integer number (174517308).

Almost surely, 2^1221434011 is an apocalyptic number.

1221434011 is a deficient number, since it is larger than the sum of its proper divisors (174704453).

1221434011 is a wasteful number, since it uses less digits than its factorization.

1221434011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26741.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1221434011 is about 34949.0201722452. The cubic root of 1221434011 is about 1068.9482228867.

Adding to 1221434011 its reverse (1104341221), we get a palindrome (2325775232).

It can be divided in two parts, 12214 and 34011, that added together give a square (46225 = 215²).

The spelling of 1221434011 in words is "one billion, two hundred twenty-one million, four hundred thirty-four thousand, eleven".