1212151425 has 48 divisors (see below), whose sum is σ = 2195216640. Its totient is φ = 587453440.

The previous prime is 1212151403. The next prime is 1212151427. The reversal of 1212151425 is 5241512121.

It is a happy number.

It is not a de Polignac number, because 1212151425 - 2¹⁷ = 1212020353 is a prime.

It is a super-2 number, since 2×1212151425² = 2938622154259061250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212151395 and 1212151404.

It is not an unprimeable number, because it can be changed into a prime (1212151427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20584 + ... + 53366.

It is an arithmetic number, because the mean of its divisors is an integer number (45733680).

Almost surely, 2^1212151425 is an apocalyptic number.

1212151425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212151425 is a deficient number, since it is larger than the sum of its proper divisors (983065215).

1212151425 is a wasteful number, since it uses less digits than its factorization.

1212151425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32842 (or 32837 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1212151425 is about 34815.9650878731. The cubic root of 1212151425 is about 1066.2334229591.

Adding to 1212151425 its reverse (5241512121), we get a palindrome (6453663546).

It can be divided in two parts, 12121 and 51425, that added together give a triangular number (63546 = T₃₅₆).

The spelling of 1212151425 in words is "one billion, two hundred twelve million, one hundred fifty-one thousand, four hundred twenty-five".