21016510303254 has 16 divisors (see below), whose sum is σ = 42034865485248. Its totient is φ = 7005195954632.

The previous prime is 21016510303181. The next prime is 21016510303267. The reversal of 21016510303254 is 45230301561012.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 76721832 + ... + 76995275.

It is an arithmetic number, because the mean of its divisors is an integer number (2627179092828).

Almost surely, 2^{21016510303254} is an apocalyptic number.

21016510303254 is an abundant number, since it is smaller than the sum of its proper divisors (21018355181994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21016510303254 is a wasteful number, since it uses less digits than its factorization.

21016510303254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153739899.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 21016510303254 its reverse (45230301561012), we get a palindrome (66246811864266).

The spelling of 21016510303254 in words is "twenty-one trillion, sixteen billion, five hundred ten million, three hundred three thousand, two hundred fifty-four".