1221130143 has 12 divisors (see below), whose sum is σ = 1775091448. Its totient is φ = 808900560.

The previous prime is 1221130121. The next prime is 1221130153. The reversal of 1221130143 is 3410311221.

It is not a de Polignac number, because 1221130143 - 2¹² = 1221126047 is a prime.

It is a super-2 number, since 2×1221130143² = 2982317652286400898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221130153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430693 + ... + 433518.

Almost surely, 2^1221130143 is an apocalyptic number.

1221130143 is a deficient number, since it is larger than the sum of its proper divisors (553961305).

1221130143 is a wasteful number, since it uses less digits than its factorization.

1221130143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864374 (or 864371 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1221130143 is about 34944.6725982660. The cubic root of 1221130143 is about 1068.8595713248.

Adding to 1221130143 its reverse (3410311221), we get a palindrome (4631441364).

The spelling of 1221130143 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, one hundred forty-three".