1255220921 has 8 divisors (see below), whose sum is σ = 1324689600. Its totient is φ = 1186092720.

The previous prime is 1255220899. The next prime is 1255220927. The reversal of 1255220921 is 1290225521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1255220921 - 2¹⁰ = 1255219897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255220927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77525 + ... + 92306.

It is an arithmetic number, because the mean of its divisors is an integer number (165586200).

Almost surely, 2^1255220921 is an apocalyptic number.

It is an amenable number.

1255220921 is a deficient number, since it is larger than the sum of its proper divisors (69468679).

1255220921 is a wasteful number, since it uses less digits than its factorization.

1255220921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170239.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1255220921 is about 35429.0970954666. The cubic root of 1255220921 is about 1078.7150129345.

The spelling of 1255220921 in words is "one billion, two hundred fifty-five million, two hundred twenty thousand, nine hundred twenty-one".