1225322021 has 16 divisors (see below), whose sum is σ = 1528564608. Its totient is φ = 954240000.

The previous prime is 1225322017. The next prime is 1225322029. The reversal of 1225322021 is 1202235221.

It is not a de Polignac number, because 1225322021 - 2² = 1225322017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225321984 and 1225322002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225322029) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 171521 + ... + 178521.

It is an arithmetic number, because the mean of its divisors is an integer number (95535288).

Almost surely, 2^1225322021 is an apocalyptic number.

1225322021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1225322021 is a deficient number, since it is larger than the sum of its proper divisors (303242587).

1225322021 is a wasteful number, since it uses less digits than its factorization.

1225322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1225322021 is about 35004.5999977146. The cubic root of 1225322021 is about 1070.0812297490.

Adding to 1225322021 its reverse (1202235221), we get a palindrome (2427557242).

The spelling of 1225322021 in words is "one billion, two hundred twenty-five million, three hundred twenty-two thousand, twenty-one".