256121002 has 8 divisors (see below), whose sum is σ = 389044800. Its totient is φ = 126439404.

The previous prime is 256120981. The next prime is 256121023. The reversal of 256121002 is 200121652.

It is an interprime number because it is at equal distance from previous prime (256120981) and next prime (256121023).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810352 + ... + 810667.

It is an arithmetic number, because the mean of its divisors is an integer number (48630600).

Almost surely, 2^256121002 is an apocalyptic number.

256121002 is a deficient number, since it is larger than the sum of its proper divisors (132923798).

256121002 is a wasteful number, since it uses less digits than its factorization.

256121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621100.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 256121002 is about 16003.7808657829. The cubic root of 256121002 is about 635.0604460202.

Adding to 256121002 its reverse (200121652), we get a palindrome (456242654).

The spelling of 256121002 in words is "two hundred fifty-six million, one hundred twenty-one thousand, two".