1021212125 has 16 divisors (see below), whose sum is σ = 1276634736. Its totient is φ = 815584000.

The previous prime is 1021212113. The next prime is 1021212131. The reversal of 1021212125 is 5212121201.

It can be written as a sum of positive squares in 8 ways, for example, as 283383556 + 737828569 = 16834^2 + 27163^2 .

It is not a de Polignac number, because 1021212125 - 2¹⁴ = 1021195741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70505 + ... + 83745.

It is an arithmetic number, because the mean of its divisors is an integer number (79789671).

Almost surely, 2^1021212125 is an apocalyptic number.

It is an amenable number.

1021212125 is a deficient number, since it is larger than the sum of its proper divisors (255422611).

1021212125 is an equidigital number, since it uses as much as digits as its factorization.

1021212125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13873 (or 13863 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1021212125 is about 31956.4097639269. The cubic root of 1021212125 is about 1007.0212943786.

Adding to 1021212125 its reverse (5212121201), we get a palindrome (6233333326).

The spelling of 1021212125 in words is "one billion, twenty-one million, two hundred twelve thousand, one hundred twenty-five".