1021211255 has 4 divisors (see below), whose sum is σ = 1225453512. Its totient is φ = 816969000.

The previous prime is 1021211251. The next prime is 1021211263. The reversal of 1021211255 is 5521121201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1021211255 - 2² = 1021211251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211251) 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, 102121121 + ... + 102121130.

It is an arithmetic number, because the mean of its divisors is an integer number (306363378).

Almost surely, 2^1021211255 is an apocalyptic number.

1021211255 is a deficient number, since it is larger than the sum of its proper divisors (204242257).

1021211255 is an equidigital number, since it uses as much as digits as its factorization.

1021211255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204242256.

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

The square root of 1021211255 is about 31956.3961516314. The cubic root of 1021211255 is about 1007.0210084084.

Adding to 1021211255 its reverse (5521121201), we get a palindrome (6542332456).

The spelling of 1021211255 in words is "one billion, twenty-one million, two hundred eleven thousand, two hundred fifty-five".