21145054250215 has 16 divisors (see below), whose sum is σ = 28999653463872. Its totient is φ = 14499104811264.

The previous prime is 21145054250189. The next prime is 21145054250237. The reversal of 21145054250215 is 51205245054112.

It is a cyclic number.

It is not a de Polignac number, because 21145054250215 - 2¹¹ = 21145054248167 is a prime.

It is a super-2 number, since 2×21145054250215² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6090174 + ... + 8909563.

It is an arithmetic number, because the mean of its divisors is an integer number (1812478341492).

Almost surely, 2^{21145054250215} is an apocalyptic number.

21145054250215 is a deficient number, since it is larger than the sum of its proper divisors (7854599213657).

21145054250215 is a wasteful number, since it uses less digits than its factorization.

21145054250215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15040026.

The product of its (nonzero) digits is 80000, while the sum is 37.

The spelling of 21145054250215 in words is "twenty-one trillion, one hundred forty-five billion, fifty-four million, two hundred fifty thousand, two hundred fifteen".