1221424130 has 16 divisors (see below), whose sum is σ = 2200678200. Its totient is φ = 488099712.

The previous prime is 1221424091. The next prime is 1221424133. The reversal of 1221424130 is 314241221.

It can be written as a sum of positive squares in 4 ways, for example, as 1120441729 + 100982401 = 33473^2 + 10049^2 .

It is not an unprimeable number, because it can be changed into a prime (1221424133) 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, 47729 + ... + 68708.

Almost surely, 2^1221424130 is an apocalyptic number.

1221424130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221424130 is a deficient number, since it is larger than the sum of its proper divisors (979254070).

1221424130 is a wasteful number, since it uses less digits than its factorization.

1221424130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117493.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221424130 is about 34948.8788089117. The cubic root of 1221424130 is about 1068.9453403989.

Adding to 1221424130 its reverse (314241221), we get a palindrome (1535665351).

The spelling of 1221424130 in words is "one billion, two hundred twenty-one million, four hundred twenty-four thousand, one hundred thirty".