1220425521 has 16 divisors (see below), whose sum is σ = 1878112128. Its totient is φ = 690480000.

The previous prime is 1220425519. The next prime is 1220425523. The reversal of 1220425521 is 1255240221.

It is an interprime number because it is at equal distance from previous prime (1220425519) and next prime (1220425523).

It is not a de Polignac number, because 1220425521 - 2¹ = 1220425519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220425491 and 1220425500.

It is not an unprimeable number, because it can be changed into a prime (1220425523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285580 + ... + 289821.

It is an arithmetic number, because the mean of its divisors is an integer number (117382008).

Almost surely, 2^1220425521 is an apocalyptic number.

It is an amenable number.

1220425521 is a deficient number, since it is larger than the sum of its proper divisors (657686607).

1220425521 is a wasteful number, since it uses less digits than its factorization.

1220425521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575512.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1220425521 is about 34934.5891774900. The cubic root of 1220425521 is about 1068.6539457191.

Adding to 1220425521 its reverse (1255240221), we get a palindrome (2475665742).

The spelling of 1220425521 in words is "one billion, two hundred twenty million, four hundred twenty-five thousand, five hundred twenty-one".