21021014251241 has 8 divisors (see below), whose sum is σ = 22975529808384. Its totient is φ = 19146274839360.

The previous prime is 21021014251217. The next prime is 21021014251243. The reversal of 21021014251241 is 14215241012012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021014251241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021014251241.

It is not an unprimeable number, because it can be changed into a prime (21021014251243) 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, 19944035765 + ... + 19944036818.

It is an arithmetic number, because the mean of its divisors is an integer number (2871941226048).

Almost surely, 2^{21021014251241} is an apocalyptic number.

It is an amenable number.

21021014251241 is a deficient number, since it is larger than the sum of its proper divisors (1954515557143).

21021014251241 is a wasteful number, since it uses less digits than its factorization.

21021014251241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39888072631.

The product of its (nonzero) digits is 1280, while the sum is 26.

Adding to 21021014251241 its reverse (14215241012012), we get a palindrome (35236255263253).

The spelling of 21021014251241 in words is "twenty-one trillion, twenty-one billion, fourteen million, two hundred fifty-one thousand, two hundred forty-one".