1257021 has 12 divisors (see below), whose sum is σ = 1911520. Its totient is φ = 793800.

The previous prime is 1257017. The next prime is 1257029. The reversal of 1257021 is 1207521.

It is not a de Polignac number, because 1257021 - 2² = 1257017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256985 and 1257003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3505 + ... + 3846.

2^1257021 is an apocalyptic number.

It is an amenable number.

1257021 is a deficient number, since it is larger than the sum of its proper divisors (654499).

1257021 is a wasteful number, since it uses less digits than its factorization.

1257021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376 (or 7373 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1257021 is about 1121.1694787141. The cubic root of 1257021 is about 107.9230418824.

The spelling of 1257021 in words is "one million, two hundred fifty-seven thousand, twenty-one".