1021225645 has 32 divisors (see below), whose sum is σ = 1408990464. Its totient is φ = 703296000.

The previous prime is 1021225643. The next prime is 1021225651. The reversal of 1021225645 is 5465221201.

It is not a de Polignac number, because 1021225645 - 2¹ = 1021225643 is a prime.

It is a super-3 number, since 3×1021225645³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021225643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123769 + ... + 131761.

It is an arithmetic number, because the mean of its divisors is an integer number (44030952).

Almost surely, 2^1021225645 is an apocalyptic number.

It is an amenable number.

1021225645 is a deficient number, since it is larger than the sum of its proper divisors (387764819).

1021225645 is a wasteful number, since it uses less digits than its factorization.

1021225645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8133.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1021225645 is about 31956.6213013829. The cubic root of 1021225645 is about 1007.0257384008.

Adding to 1021225645 its reverse (5465221201), we get a palindrome (6486446846).

The spelling of 1021225645 in words is "one billion, twenty-one million, two hundred twenty-five thousand, six hundred forty-five".