1254021 has 4 divisors (see below), whose sum is σ = 1672032. Its totient is φ = 836012.

The previous prime is 1254017. The next prime is 1254023. The reversal of 1254021 is 1204521.

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: 1204521 = 3 ⋅401507.

It is a cyclic number.

It is not a de Polignac number, because 1254021 - 2² = 1254017 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1254023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209001 + ... + 209006.

It is an arithmetic number, because the mean of its divisors is an integer number (418008).

2^1254021 is an apocalyptic number.

It is an amenable number.

1254021 is a deficient number, since it is larger than the sum of its proper divisors (418011).

1254021 is an equidigital number, since it uses as much as digits as its factorization.

1254021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418010.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1254021 is about 1119.8307907894. The cubic root of 1254021 is about 107.8371172940.

Adding to 1254021 its reverse (1204521), we get a palindrome (2458542).

It can be divided in two parts, 12540 and 21, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 1254021 in words is "one million, two hundred fifty-four thousand, twenty-one".