1213421625 has 96 divisors (see below), whose sum is σ = 2437737120. Its totient is φ = 576576000.

The previous prime is 1213421617. The next prime is 1213421633. The reversal of 1213421625 is 5261243121.

1213421625 is a `hidden beast` number, since 1 + 2 + 1 + 34 + 2 + 1 + 625 = 666.

It is an interprime number because it is at equal distance from previous prime (1213421617) and next prime (1213421633).

It can be written as a sum of positive squares in 16 ways, for example, as 1012576041 + 200845584 = 31821^2 + 14172^2 .

It is not a de Polignac number, because 1213421625 - 2³ = 1213421617 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 422695 + ... + 425555.

It is an arithmetic number, because the mean of its divisors is an integer number (25393095).

Almost surely, 2^1213421625 is an apocalyptic number.

1213421625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213421625 is an abundant number, since it is smaller than the sum of its proper divisors (1224315495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213421625 is a wasteful number, since it uses less digits than its factorization.

1213421625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924 (or 2911 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1213421625 is about 34834.2019429181. The cubic root of 1213421625 is about 1066.6057243286.

Adding to 1213421625 its reverse (5261243121), we get a palindrome (6474664746).

The spelling of 1213421625 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, six hundred twenty-five".