1221131435 has 8 divisors (see below), whose sum is σ = 1479585120. Its totient is φ = 967420224.

The previous prime is 1221131423. The next prime is 1221131453. The reversal of 1221131435 is 5341311221.

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 1221131435 - 2⁴ = 1221131419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221131435.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1185050 + ... + 1186079.

It is an arithmetic number, because the mean of its divisors is an integer number (184948140).

Almost surely, 2^1221131435 is an apocalyptic number.

1221131435 is a deficient number, since it is larger than the sum of its proper divisors (258453685).

1221131435 is a wasteful number, since it uses less digits than its factorization.

1221131435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371237.

The product of its digits is 720, while the sum is 23.

The square root of 1221131435 is about 34944.6910846269. The cubic root of 1221131435 is about 1068.8599482887.

Adding to 1221131435 its reverse (5341311221), we get a palindrome (6562442656).

The spelling of 1221131435 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, four hundred thirty-five".