21115654250435 has 16 divisors (see below), whose sum is σ = 25557416295840. Its totient is φ = 16747023870720.

The previous prime is 21115654250423. The next prime is 21115654250443. The reversal of 21115654250435 is 53405245651112.

It is a happy number.

It is not a de Polignac number, because 21115654250435 - 2⁴ = 21115654250419 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15248450 + ... + 16575479.

It is an arithmetic number, because the mean of its divisors is an integer number (1597338518490).

Almost surely, 2^{21115654250435} is an apocalyptic number.

21115654250435 is a deficient number, since it is larger than the sum of its proper divisors (4441762045405).

21115654250435 is a wasteful number, since it uses less digits than its factorization.

21115654250435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31825078.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 21115654250435 in words is "twenty-one trillion, one hundred fifteen billion, six hundred fifty-four million, two hundred fifty thousand, four hundred thirty-five".