1221234131 has 8 divisors (see below), whose sum is σ = 1316034384. Its totient is φ = 1126556640.

The previous prime is 1221234107. The next prime is 1221234143. The reversal of 1221234131 is 1314321221.

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 1221234131 - 2⁶ = 1221234067 is a prime.

It is a super-2 number, since 2×1221234131² = 2982825605438650322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221234191) 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, 9476 + ... + 50321.

It is an arithmetic number, because the mean of its divisors is an integer number (164504298).

Almost surely, 2^1221234131 is an apocalyptic number.

1221234131 is a deficient number, since it is larger than the sum of its proper divisors (94800253).

1221234131 is a wasteful number, since it uses less digits than its factorization.

1221234131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61381.

The product of its digits is 288, while the sum is 20.

The square root of 1221234131 is about 34946.1604614870. The cubic root of 1221234131 is about 1068.8899108194.

Adding to 1221234131 its reverse (1314321221), we get a palindrome (2535555352).

The spelling of 1221234131 in words is "one billion, two hundred twenty-one million, two hundred thirty-four thousand, one hundred thirty-one".