1255021211 has 4 divisors (see below), whose sum is σ = 1267959672. Its totient is φ = 1242082752.

The previous prime is 1255021147. The next prime is 1255021217. The reversal of 1255021211 is 1121205521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1121205521 = 43 ⋅26074547.

It is a cyclic number.

It is not a de Polignac number, because 1255021211 - 2⁶ = 1255021147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255021217) 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, 6469085 + ... + 6469278.

It is an arithmetic number, because the mean of its divisors is an integer number (316989918).

Almost surely, 2^1255021211 is an apocalyptic number.

1255021211 is a deficient number, since it is larger than the sum of its proper divisors (12938461).

1255021211 is an equidigital number, since it uses as much as digits as its factorization.

1255021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12938460.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1255021211 is about 35426.2785372667. The cubic root of 1255021211 is about 1078.6578008008.

Adding to 1255021211 its reverse (1121205521), we get a palindrome (2376226732).

The spelling of 1255021211 in words is "one billion, two hundred fifty-five million, twenty-one thousand, two hundred eleven".