1257472256221 has 8 divisors (see below), whose sum is σ = 1269764288000. Its totient is φ = 1245181831632.

The previous prime is 1257472256113. The next prime is 1257472256291. The reversal of 1257472256221 is 1226522747521.

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 1257472256221 - 2²⁷ = 1257338038493 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 (1257472256291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201780 + ... + 1989778.

It is an arithmetic number, because the mean of its divisors is an integer number (158720536000).

Almost surely, 2^{1257472256221} is an apocalyptic number.

It is an amenable number.

1257472256221 is a deficient number, since it is larger than the sum of its proper divisors (12292031779).

1257472256221 is a wasteful number, since it uses less digits than its factorization.

1257472256221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803595.

The product of its digits is 940800, while the sum is 46.

The spelling of 1257472256221 in words is "one trillion, two hundred fifty-seven billion, four hundred seventy-two million, two hundred fifty-six thousand, two hundred twenty-one".