1220253421 has 4 divisors (see below), whose sum is σ = 1292033052. Its totient is φ = 1148473792.

The previous prime is 1220253413. The next prime is 1220253427. The reversal of 1220253421 is 1243520221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243520221 = 12343 ⋅100747.

It can be written as a sum of positive squares in 2 ways, for example, as 773396100 + 446857321 = 27810^2 + 21139^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220253421 - 2³ = 1220253413 is a prime.

It is a super-5 number, since 5×1220253421⁵ (a number of 47 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220253392 and 1220253401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220253427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35889790 + ... + 35889823.

It is an arithmetic number, because the mean of its divisors is an integer number (323008263).

Almost surely, 2^1220253421 is an apocalyptic number.

It is an amenable number.

1220253421 is a deficient number, since it is larger than the sum of its proper divisors (71779631).

1220253421 is an equidigital number, since it uses as much as digits as its factorization.

1220253421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71779630.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1220253421 is about 34932.1259158386. The cubic root of 1220253421 is about 1068.6037107842.

Adding to 1220253421 its reverse (1243520221), we get a palindrome (2463773642).

The spelling of 1220253421 in words is "one billion, two hundred twenty million, two hundred fifty-three thousand, four hundred twenty-one".