1225021 has 4 divisors (see below), whose sum is σ = 1400032. Its totient is φ = 1050012.

The previous prime is 1225019. The next prime is 1225061. The reversal of 1225021 is 1205221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1205221 = 47 ⋅25643.

It is a cyclic number.

It is not a de Polignac number, because 1225021 - 2¹ = 1225019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1224992 and 1225010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87495 + ... + 87508.

It is an arithmetic number, because the mean of its divisors is an integer number (350008).

2^1225021 is an apocalyptic number.

It is an amenable number.

1225021 is a deficient number, since it is larger than the sum of its proper divisors (175011).

1225021 is an equidigital number, since it uses as much as digits as its factorization.

1225021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175010.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1225021 is about 1106.8066678513. The cubic root of 1225021 is about 106.9993594744. Note that the first 3 decimals are identical.

The spelling of 1225021 in words is "one million, two hundred twenty-five thousand, twenty-one".