21018754268 has 48 divisors (see below), whose sum is σ = 37467105984. Its totient is φ = 10316328960.

The previous prime is 21018754223. The next prime is 21018754271. The reversal of 21018754268 is 86245781012.

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, 22054880 + ... + 22055832.

It is an arithmetic number, because the mean of its divisors is an integer number (780564708).

Almost surely, 2^21018754268 is an apocalyptic number.

It is an amenable number.

21018754268 is a deficient number, since it is larger than the sum of its proper divisors (16448351716).

21018754268 is a wasteful number, since it uses less digits than its factorization.

21018754268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 21018754268 in words is "twenty-one billion, eighteen million, seven hundred fifty-four thousand, two hundred sixty-eight".