1210421525 has 12 divisors (see below), whose sum is σ = 1501420644. Its totient is φ = 968016000.

The previous prime is 1210421507. The next prime is 1210421549. The reversal of 1210421525 is 5251240121.

It can be written as a sum of positive squares in 6 ways, for example, as 137334961 + 1073086564 = 11719^2 + 32758^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1210421525 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210421525.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94505 + ... + 106545.

It is an arithmetic number, because the mean of its divisors is an integer number (125118387).

Almost surely, 2^1210421525 is an apocalyptic number.

It is an amenable number.

1210421525 is a deficient number, since it is larger than the sum of its proper divisors (290999119).

1210421525 is a wasteful number, since it uses less digits than its factorization.

1210421525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16072 (or 16067 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1210421525 is about 34791.1127301212. The cubic root of 1210421525 is about 1065.7259628915.

Adding to 1210421525 its reverse (5251240121), we get a palindrome (6461661646).

The spelling of 1210421525 in words is "one billion, two hundred ten million, four hundred twenty-one thousand, five hundred twenty-five".