1221057 has 12 divisors (see below), whose sum is σ = 1774864. Its totient is φ = 808920.

The previous prime is 1221049. The next prime is 1221061. The reversal of 1221057 is 7501221.

It is not a de Polignac number, because 1221057 - 2³ = 1221049 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1221097) 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, 1578 + ... + 2220.

2^1221057 is an apocalyptic number.

It is an amenable number.

1221057 is a deficient number, since it is larger than the sum of its proper divisors (553807).

1221057 is a wasteful number, since it uses less digits than its factorization.

1221057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 857 counting only the distinct ones).

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

The square root of 1221057 is about 1105.0144795431. The cubic root of 1221057 is about 106.8838230122.

Adding to 1221057 its reverse (7501221), we get a palindrome (8722278).

The spelling of 1221057 in words is "one million, two hundred twenty-one thousand, fifty-seven".