21250241126465 has 16 divisors (see below), whose sum is σ = 27462022795200. Its totient is φ = 15692387055552.

The previous prime is 21250241126459. The next prime is 21250241126489. The reversal of 21250241126465 is 56462114205212.

It is a cyclic number.

It is not a de Polignac number, because 21250241126465 - 2²⁰ = 21250240077889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10346546 + ... + 12229124.

It is an arithmetic number, because the mean of its divisors is an integer number (1716376424700).

Almost surely, 2^{21250241126465} is an apocalyptic number.

It is an amenable number.

21250241126465 is a deficient number, since it is larger than the sum of its proper divisors (6211781668735).

21250241126465 is a wasteful number, since it uses less digits than its factorization.

21250241126465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056256.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 21250241126465 in words is "twenty-one trillion, two hundred fifty billion, two hundred forty-one million, one hundred twenty-six thousand, four hundred sixty-five".