1220024021 has 2 divisors, whose sum is σ = 1220024022. Its totient is φ = 1220024020.

The previous prime is 1220024009. The next prime is 1220024041. The reversal of 1220024021 is 1204200221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1184323396 + 35700625 = 34414^2 + 5975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220024021 - 2¹⁸ = 1219761877 is a prime.

It is a super-2 number, since 2×1220024021² = 2976917223634016882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220023987 and 1220024005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220024041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610012010 + 610012011.

It is an arithmetic number, because the mean of its divisors is an integer number (610012011).

Almost surely, 2^1220024021 is an apocalyptic number.

It is an amenable number.

1220024021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220024021 is an equidigital number, since it uses as much as digits as its factorization.

1220024021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1220024021 is about 34928.8422510681. The cubic root of 1220024021 is about 1068.5367429861.

Adding to 1220024021 its reverse (1204200221), we get a palindrome (2424224242).

The spelling of 1220024021 in words is "one billion, two hundred twenty million, twenty-four thousand, twenty-one".